Yo Mama's Ugliness

Okay, Zach, you're clearly not the sharpest tool in the shed, so let me break this down for you. You, yes you, thought this was a 'good' joke. The humor lies in how unbelievably ugly 'yo mama' is portrayed, so much that a cartoon cat, Hello Kitty, known for being cute, wouldn't even want to be around her. Get it? It's an exaggeration to say that someone is so ugly even a fictional character would be turned off.