Yo Mama Sits on Walmart

Alright, listen up, you chucklehead. This "yo mama" gag is all about exaggerating how fat someone's mama is. In this case, she's so massive that when she plops down on a Walmart, it's like a freakin' sale event! The prices drop 'cause she squashed everything, or something. It ain't rocket science, but it's clearly above your pay grade.