My favourite was always
Your mum's so fat that when she jumped in the air she got stuck.
(
Afinkawan Yes I can hear you Clem Fandango,
Mon 20 Nov 2006, 10:47,
archived)
not to forget
your mum's so ugly when she was born they pulled out the afterbirth and shouted "twins!"
(
gravytrain,
Mon 20 Nov 2006, 10:51,
archived)
I'll chip in my contribution
Your mommas so fat, when she sits round the house, she sits round the whole house.
Your mommas so fat shes on both sides of the family
(
Wize,
Mon 20 Nov 2006, 12:52,
archived)