There's been a few of these doing the rounds recently, these are the best of the ones I've heard...unless you know better?
Your mum's so fat, she had to have her ears pierced so the kids could see the telly.
Your mums so fat your dad keeps burning his bum on the bedroom ceiling light when he get's it on with her
Your mum is so fat, she got arrested at the airport for ten pounds of crack
Your mum is so fat that she got on an airplane and only the wings took off!
Your mums so fat, I swerved to avoid her and ran out of petrol.
Your mum's so fat she has her own gravitational field.
Your mum's so fat you don't walk with her, more amongst her.
And my personal favorite today……
Your mum’s so fat, when she fell down the stairs I thought it was Eastenders ending on the t.v.
Your mum's so fat, she had to have her ears pierced so the kids could see the telly.
Your mums so fat your dad keeps burning his bum on the bedroom ceiling light when he get's it on with her
Your mum is so fat, she got arrested at the airport for ten pounds of crack
Your mum is so fat that she got on an airplane and only the wings took off!
Your mums so fat, I swerved to avoid her and ran out of petrol.
Your mum's so fat she has her own gravitational field.
Your mum's so fat you don't walk with her, more amongst her.
And my personal favorite today……
Your mum’s so fat, when she fell down the stairs I thought it was Eastenders ending on the t.v.