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a result of anal sex, a reverse cakester is the combination of defacation through a butthole that has recently been ejaculated into, thus creating a chocolate log coated in semen.
Jim didn't pull out when he stuffed it in Sally's backdoor, so when she went to "freshen up" afterward she was joined by a lovely reverse cakester as a midnight snack.

cum + poop = reverse cakester
by F.U.P.A. July 29, 2011
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