Top Definition
when you creep up behind someone and when they aren't looking take whatever you have in your hand (whatever object) and shuv it as far in as possible.
I was walking through the hall today trying to get to class and suddenly I feel this big object slowly going up my ass. I turn around and see some random jock with his waterbottle in his hand coming from my ass laughing. He told me I just got analcreeped and he was the analcreeper
by herbalist345 June 02, 2010
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