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To put your own or someone elses flacid penis in their own butthole.
Person 1: Alright I'm gonna do it

Person 2: Your gonna put your own dick your own butt?

Person 1: Yeah, seems cool.

Person 2: Is it that big that you can Loopback?

Person 1: Yeah, other people might have to stretch it if it's to small.
by Alexander4005 January 19, 2006