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1.
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."
od uživatele Ben 10. Září 2003
 
2.
"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!!!
od uživatele J R Stokes 04. Červenec 2004
 
3.
the first two words of some of the best and worst jokes of all time
Yo mama so fat that when she sits down, the record skips. AT THE RADIO STATION!!
od uživatele kymcleod 12. Říjen 2003
 
4.
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!
od uživatele Nasty Nate 03. Říjen 2003
 
5.
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!

od uživatele GABEMSTR 14. Listopad 2006
 
6.
1) A group of jokes meant to criticize one's mother by saying that she is fat, ugly, stupid, etc.

2) A lame phrase someone I know keeps saying whenever I ask him a question about PE because he has it before me.
1) Yo mama so ugly people watch her during horror movies.

2) Me: Hey, what are we doing in Pe today?

Him: Yo Mama!

Me: Shut the f up.
od uživatele army_azn 09. Prosinec 2004
 
7.
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
od uživatele The Child 28. Březen 2008