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1.
A term that originated in street diming which precedes an inventive insult to the other person's mother. Presumably because once upon a time, in the 'hood, Mothers were highly prized.
"Yo mama" so fat, she have to go downstairs sideways.
by Ajjax August 19, 2006
 
2.
meaning: your mother
"yo mama" is on her way home
by Baptiste August 18, 2006
 
3.
An derisive term, equivalent to motherfucker but can be used in general company because it's not a swear word. Term often precedes a fight.
Thug #1: I will cut you up!
Thug #2 : "yo mama"."
Thug #1 swings and the fight is on.
by Ajjax August 19, 2006