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To bring oneself to orgasm by various acts of anal-simulation.
Vanilla masturbation doesn't work for me anymore, now the only way I can cum is if I assturbate.
by Tenshin_ April 07, 2016
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1. to clean the inside of your ass, usually before mooning, i.e. checing for toilet paper, etc
2. to play with your ass, like masturbating, but with anal sex
3. to touch the inside of someone else's ass
1. "dude, assturbate before you moon them, you dont know whats in there."
2. "you shouldn't assturbate, it maks the inside of your ass all itchy!"
3. "she groaned loudly as I assturbated her"
by baruchuh November 02, 2006
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