Top definition
Phrase, to "crack a fat", to get an erection.

Possibly related to the British phrase to "crack one off", to masturbate successfully.

"Crack a fat" is commonly used in Australia.
The teacher wanted me to solve the equation on the blackboard, but I'd cracked a fat (being 15 and all) and was afraid to stand up.
by Frantic November 25, 2003
Get the mug
Get a Crack a fat mug for your fish Julia.