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Crack a stiffy

The process where ones penis changes state from being flaccid to being erect.

Commonly used in Australia

Also know as crack a fat
Scene: At the local swimming carnival, Peter has just one the 100m freestyle event. Elated, he leaps from the pool in his DTs (dick togs) but clearly he has an erection.

Mary:- OMG whats going on with the front of Peters togs?
Sarah:- Der Mary, ever heard the term crack a stiffy!
by REDDORDOP April 20, 2017
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