One At A time

Yo Mama's so fat, when she steps on a scale, it read "One at a time, please."

G-string

Yo mama's so fat, she don't wear a G-String, she wears an A, B, C, D, E, F,G-String.

Yo Mama - Beeper

Yo' Mama is so fat, a beeper goes off whenever she backs up.