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."
by Ben September 11, 2003
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"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

Girl 1: That Girl is a slut.
Random Guy 1: YO MOMA'S A SLUT!!!
by J R Stokes July 5, 2004
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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!
by Nasty Nate October 3, 2003
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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!

by GABEMSTR November 15, 2006
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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!!
by kymcleod October 12, 2003
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Literally means your mother. It is sometimes used for mockery or insults. For example:

Guy 1: Guess who's gonna kick your ass?
Guy 2: i know who's gonna kick yours.
Guy 1: who?
Guy 2: Yo mama. Aha!
by MOshizzle November 23, 2007
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Yo mama's so fat, it took 500 pages just to fit her in Guiness
Yo mama's so fat, when she ran for congress, she represented 10 states
Yo mama's so fat, she auditioned for Terminator 3 and got the part as the human resistance
Yo mama's glases are so thick, she starts fires everytime she reads
Yo mama's teeth are so yellow, she has to wear sunglasses to look in the mirror
by Gary Destruction April 2, 2004
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