It's where two individuals put their ass cheeks together and begin contracting their anus in rhythmic form - contract and relax. It can be be quick or slow, or even hard pressed like a french kiss. Typically performed by homosexuals. (I assume lol)
Dude...I think Neil is rectal kisser.

Hey man, what the fuck are Neil and Bob doing in there? They been in there for over an hour. I bet their rectal kissing again!
by F.O.O.C.H January 3, 2009
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