Top Definition
After-on when after sex or masturbation u still have a slight hard on that could easily be encouraged into a rageing hard on. usually uncomfortable if u go to sleep with it as the slightest amoun of rubbing or wet dream will make it hard and uncomfortable.
i had to have a midnight wack off session becuase i was stupid enough to go to sleep with an after-on.
by Andrewferrot March 31, 2011

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