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When you are having anal sex with a girl, right before you cum in her ass your hit her over the head and knock her out. This makes her asshole tighten up really quick, enhancing sexual pleasure.
Yo i was doing Amy up the butt last night and I tried the donkey buster on her...it works great! She tightened up so fast i almost couldnt get it out.
by bloodbath428 April 24, 2006
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