Variant of yo mama
1.)who i took home last night; my bitch.
2.)an insult that can be used at inappropriate times:
sito- Hey dre, what character did u pick?
dre- jo mama!
3.a person who engages in sexual activity with the opposite sex often:
I was with jo mama last night!
Also means to rape that monkey jumping on top of that hot busty chick on the dance floor.