The act of ingesting an entire bottle of sleeping pills and then attempting to whack off before falling asleep.
Martyn: You guys ever tried sleep wanking?
Zach: Yeah! It's great cause you always win
Steven: Unfortunately you can never stay awake long enough to clean up the mess...
Lads: Aye!
av Martyn with a 'y ' bitches 26 juli 2008
Indulging in the act of masturbation while sleeping, usually performed by a man during a period of sexual frustration.
Tim has never had sex. One day, he woke up in his bed with a puddle by his side; he was sleepwanking.
av Elvis O'Keefe 26 september 2011

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