The erection one has in the morning hours.
I woke up with the biggest piss fat this morning. My girlfriend thought she had excited me and decided to blow me. I think I accidently did a few wee drops in her mouth.
by Penis Master July 27, 2003
Aussie term for a morning erection brought on by a full bladder.
don't jack it: it's a pissfat!!
by skirtlifter January 10, 2005
When you hold your pee-pee in your pay-pay so it looks bigger when you try to kerr a reenie
This pissfat is very effective at seducing the femiles
by Bardem Productions November 20, 2014

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