a knee-slapper

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a knee-slapper

A hilarious joke, especially one that evokes loud and prolonged laughter. My uncle told me a real knee-slapper the other day! Do you want to hear it?
References in periodicals archive ?
Ohh, please: That's a knee-slapper - Geraldo Rivera is calling for an end to misrepresentation and exploitation on TV talk shows.
Boy, was this a knee-slapper, punctuated by overly forced guffaws, darting glances, and seat-squirming so characteristic of those who doth protest too much.
None of the rest of us in the class considered the anecdote a knee-slapper, but we understood what he meant.