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1.To "manually pleasure" a girl
I hear Dazza gave her the old one-two

They've gone to the other room for a bit of one-two
by getyourhaircut October 12, 2007
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2
onetwo is when you take a shit in a urinal.
i had to drop a deuce, but all the crappers were taken. i had to drop a onetwo in there. its gonna be hell cleanin that shit up.
by hotcarl85 August 12, 2008
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