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1.
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
107 18
 
2.
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
69 12
 
3.
to obtain an erection, or hard on
dont crack a fat over her cuz she will look like her mother in 10 years
by beccabee charmer May 08, 2008
18 7
 
4.
to achieve an erection
jak couldn't crack a fat! how embarassing
by shitface1234567890 April 16, 2011
4 3
 
5.
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
26 54