I know that it is very important to be aware of "hidden meanings" of words and phrases. (Especially if the meaning is sexual.) That is why I love Stephen Colbert's "The Word" segments and usually spend some time to "decipher" all the puns
But I am really stuck with the recent one. Particularly I cannot understand the
"After all 7 8 9" line here. From the reaction of the audience I can tell that it is something pretty funny. And from the context I feel that it is something pretty dirty...
I really don't want to be misunderstood by saying bunch of numbers. So can someone explain what is going on here, so I can avoid that?