In Portuguese, “entendedores entenderão”, which literally can be translated to “those who understand understand”, is often used on the internet.

Someone might write this when (s)he posts something that only people with knowledge on the subject would be able to comprehend. For example, when posting a joke about mathematics.

Is there an idiomatic expression that means the same thing in English? I tried googling the phrase “whoever gets it”, hoping it would lead to some expression, but I did not find anything.

  • An "inside joke" or an "in-joke". Jan 7, 2022 at 20:00
  • 2
    Reminds me of a rather clever advertising slogan that the Washington Post used to use: "If you don't get it, you don't get it."
    – Papa Poule
    Jan 7, 2022 at 20:01
  • 1
    He that has ears to hear, let him hear.
    – fev
    Jan 7, 2022 at 20:03
  • 2
    Nudge nudge. Wink wink. Say no more. Jan 7, 2022 at 20:21
  • 2
    I would tell you a UDP joke, but you might not get it. Jan 9, 2022 at 0:11

5 Answers 5


The common expression in English is "If you know, you know."

Urbandictionary has a good definition:

The defining phrase of an inside joke/access to information only a select few know about


Since those who understand will understand without much explanation ...

A word to the wise is sufficient.

The saying introduces a statement as advice: A word to the wise—never sign a contract without reading it first.

  • Or if you're really fancy, verb sap which is an abbreviation of the Latin.
    – Stuart F
    Jan 8, 2022 at 15:42

I have heard:

(Only) Those in the know will understand.

Collins explains that

If you are in the know about something, especially something that is not known about or understood by many people, you have information about it.


Inside joke is quite common:

inside joke

: a joke that is understood only by people with special knowledge about something

(Merriam Webster)

A more general term is "esoteric":


intended for or likely to be understood by only a small number of people with a specialized knowledge or interest.


Esoteric joke/pun/statement/concept


For the usage given in the question:

For example, when posting a joke about mathematics

I suggest


A joke that is understood or appreciated by only a small group of people.

Also inside joke.

From Lexico here and here.

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