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1.
v. Masturbate.
She wouldn't put out, so I had to crack one off instead.
by Pecan Pie April 30, 2004
 
2.
v. To blow your load, or cum
"I got so excited when I saw her that I nearly cracked one off."
by BigJC December 01, 2003
 
3.
v. To fart, usually loudly or pugnaciously.
Some dude on the train cracked one off as I passed him by.
by Niall February 11, 2004