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1. A phrase used as a formal declaration of defeat. For example: "Kenneth replied 'yo mama' when he realized he could not counter his opponent's point."

2. The principle part of a "Yo Mama" joke, usually entailing a description of your mother being so "something" that "something" occurred as a result.
1. Amy: You're so ugly!
Gwen: Yeah, well so's YO MAMA!

2. "Yo mama so fat, the last time she saw 90210 was on a scale!"
"Yo mama so dumb, she thought a quarterback was a refund."
yo mama by Ben September 10, 2003
Word of the Day on May 14, 2006
Rounded, low brain capacity, very hairy, creator of jokes.
Yo mama so fat
Yo mama by HxYdyfsdob July 13, 2016

yo mama! 

1. a TV show with Wilbur Valderama(Fez from "That 70's Show"
2. A cruel start to a funny joke.
3. Your mother.
1. "time for YO MAMA!!!"
2. "Yo mama so fat when she sit's on a rainbow skittles fall out."
3. Lynn Ann Wilson
yo mama! by The Child March 28, 2008
"yo moma" is something you say in front of every sentence that some1 says just to piss then off
Guy 1: I'm going to tie my shoes
Guy 2: YO MOMA'S GONA TIE HER SHOES!!!

Girl 1: That Girl is a slut.
Random Guy 1: YO MOMA'S A SLUT!!!
yo mama by J R Stokes July 4, 2004
They call yo mama "The Squirrel" cuz she always got nuts in her mouth!
Yo mama like the bus: everybody gets a ride for one dollar!
yo mama by Nasty Nate October 3, 2003
Slang for "your mom". A nice insult! Talking about your mom is really insulting.
Ex. 1
Some guy: Get a life...
Person responding: Yo mama!
Some guy: What did you say! *beats up person responding

Ex. 2
Some guy: You fat pig...
person responding: Yo mama's a fat pig!

yo mama by GABEMSTR November 10, 2008