Here's some classy originals.
Your mama's so fat, gasping for breath she sang
' Come, Butter!
Come, Butter!
Come, Butter,
Come!
Every lump
As big as
My bum!'
Your mama's so ugly, when she asked me if I wanted to ****, I told her I greatly preferred masturbation.
Your mama's so fat, they collect the steam from her hot hole to power our cities.
Your mama's so fat, when she dies, the world's energy problems will be solved.
You mama's so slutty, I lit a match on her snatch and burnt the front of her ****.