When a group of friends have an inside joke, and another person is asking what's so funny. Definition comes from the movie 'Menace to Society'.
Caine: You don't wanna go out like Willy Lump Lump.
Sharif: Who is Willy Lump Lump anyway?
Caine: Ah man, don't worry about it, it's an inside thing.
"What are y'all laughing at"?
"It's a Willy Lump Lump, don't worry about it. You wouldn't understand."
Person 1: What's so funny?
Person 2: (they smack their lips and look person 1 up and down crazy-like and says) Willy Lump Lump
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