Put down 4 of the best Yo Mama jokes. No copying other people here. 1. Yo mama's so ugly that people dress as her on Halloween 2. Yo mama's so stupid she stayed up all night trying to catch some sleep 3. Yo mama's so fat her bellybutton makes it home 15 minutes before her. 4. Spoiler Yo mama's so stupid she got fired from a blowjob