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To masturbate
see also: wank, frig, toss, tommy-tank, make the bald man cry, choke the money etc etc
John cracked one out in the toilets during his lunch-break.
by Master Bates September 18, 2003
To lascerate your cock while 'watching videos of/imagining/looking at photos of/in the presence of' hot sexy women.

Masturbation in laymans terms.
James: "Im going home for a wank."
Tim: "haha, james is gonna crack one out, the randy bastard, remember to clean yourself up, and your mums back, dont be rubbin the cum into her back too much again".
by Professor Stupidity March 29, 2008