I received an email from a coworker, and we're not that friendly. Actually, we're not friends at all, just two good colleagues. In his email, he wrote as his last sentence

Catch you on the flip side!

What does this expression mean?

Note that I was supposed to get a job, and the answer was no. The email was kind of sad.

  • -1 and voting to close as general reference: Google links to five definitions on the first page.
    – Hugo
    Commented Dec 12, 2011 at 4:46
  • 2
    @Hugo, don't be so strict, almost everything can be quickly googled. This is all about: 1) how relevant is question for this specific Stack 2) how interesting are comments.
    – shabunc
    Commented Jul 23, 2012 at 15:17

4 Answers 4


The phrase "catch you on the flip side" is a very colloquial way of saying "See you tomorrow". It's unusual and unprofessional to see it in a business email.

  • 7
    Note that "the flip side" has its origins in analog recording media, such as vinyl recordings. "The flip side" of an album was the way one might refer to the B-side, or side 2.
    – Robusto
    Commented Aug 8, 2011 at 13:54
  • 1
    I endorse your definition, but think you are overgeneralizing on the usage advice. I'm sure in some parts of the business world, but few 'techies' in the US would be surprised to see such informal wordplay in an email from a colleague.
    – Spike0xff
    Commented Nov 5, 2015 at 21:05

I guess it depends on the context.

Yes, it was derived from the "flip side" of vinyl records, however it became a phrase equivalent to: "see you later/soon". But again, to me it depends on the context. For example, if someone is about to do something life threatening (or over exaggerated as life threatening) it could mean "see you in the after life", making the flip side, in this case, heaven. For example:

Oh my, I'm gonna jump out of a plane now… Catch you on the flip side.

Another instance where it could be used is obviously just "see you tomorrow". I once heard a theory that the flip side meant something or other about the Earth rotating through its 24 hour cycle, hence making the the flip side the following day.

Finally, the way I always thought it was taken is when you are saying goodbye to someone who you are unsure whether you may see again. Such as… Well tomorrow is my last day of high school so quite relevantly saying goodbye to classmates and teachers you may never run into again. Or perhaps someone you befriended one day on city transit and probably won't run into again. Or maybe a coworker leaving… Whatever it may be, I thought the flip side was just symbolic for the unknown. To sum it all up, I guess to me it meant "It's uncertain we'll meet again, but I hope we do."


I believe it means something like "See you next time we meet", often with an implication that the next time is known, assumed or hoped.

Here is a good example of where the next time is hoped: (Yes, I'm citing the Urban Dictionary, look at number 4)

In the early stages of spaceflight, NASA developed a technique that saved much needed fuel to return space craft back to Earth by using the moon’s orbit like a slingshot. Astronauts in space and ground control would lose radio signal once the space craft makes its way to the “back-side” of the moon and away from line of sight with Earth. They would of course regain radio signal when they reach the other side of the moon (the “flip side”). It was customary for Ground Control to say “Catch you on the flip side” before they would lose radio signal. The none-space working-class community adapted the phrase as a “good-bye” or “see you later.”

  • I don't really trust UD, since I've submitted imaginary entries myself... I wonder if this is folk etymology? Do you have a more authoritative cite?
    – Spike0xff
    Commented Nov 5, 2015 at 21:15
  • @Spike0xff I DO NOT have a better source tor this, your doubts are valid.
    – Shawn
    Commented Nov 5, 2015 at 22:29
  • The phrase (or something very similar) was used in the film Apollo 13, by Kevin Bacon's character, I think. Source: I worked in a cinema in the mid 90s.
    – mwardm
    Commented Feb 22 at 12:49

I was once told by this random ass hippy chick that it has to do with the theory of expansion and contraction as it relates to the universe and the Big Bang Theory. At the moment our universe is expanding and therefore “moving forward in time”. When the universe starts contracting, everything, including time, will start reversing. We will then start going through our lives in reverse, from death to birth and everything in between. So i take it as something you say to someone you don’t think you will see again in the “forward” aspect of life.

  • 1
    Much as I love hippy chicks, this question can be improved by adding reliable reference sources.
    – MetaEd
    Commented Oct 10, 2012 at 16:39

Not the answer you're looking for? Browse other questions tagged or ask your own question.