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
To obtain or gain an erection
Aussie phrase
"He was so drunk he couldn't even Crack a fat"
by Sarah Kayness November 04, 2004
what happens to me when your mother enters the room
damn i'm gonna need a cold shower after this!
by Col Crass in the ass April 08, 2005
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