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.

"yo moma" is something you say in front of every sentence that some1 says just to piss then off

the first two words of some of the best and worst jokes of all time

They call yo mama "The Squirrel" cuz she always got nuts in her mouth!

Slang for "your mom". A nice insult! Talking about your mom is really insulting.

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.

pathetic retort; unidentified insult aimed at precipient's mother when the speaker has the inability to think of a half-decent comeback.