Its a joke where you talk trash about another persons mom, sometimes for revenge.
person 1: YO MAMA SO FAT-
person 2: SHUT UP!!!!11!
Yo mama is a meme used by the coolest, most dope car wash in the world.
Yo mama’s car is so flawless, even Beyoncé gets jealous.
the beginning of a funny and weird joke
yo mama so fat when thanos snapped his fingers she only lost weight!
it means your mother/tu madre/mama. "yo mama" is an inside joke in 2015/today.