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
by Emperor C May 09, 2019
Get a Willy Lump Lump mug for your papa Jerry.
A male with a sexual disease.
I ain't cutting wit dat bitch. I ain't going out like willie lump lump.
by Hunter September 14, 2004
Get the willie lump lump neck gaiter and mug.
This is a man who says "Oh my god" and "You're kiddin' me" a lot. He dances like Carlton, mostly to the song "Apache" by Sugar Hill Gang. He eats excessive amounts of White Castles and irons his underwear and socks every day.
"Oh my god, I'm a regular willy lump lump. I can't wait to go to White Castle today, right after I finish ironing these tidy whiteys. I hope I hear "Tonto, jump on it" in the car on the way there!"
by Cocheeze October 13, 2007
Get the willy lump lump neck gaiter and mug.
A man or a boy who hates on his friend or associate by going behind his back and try to get him in trouble or sleep with his girlfriend or say embarrassing comments around him to get him in trouble.
by Kip other September 22, 2020
Get the Willie lump lump neck gaiter and mug.