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1.
1. To have sex from behind (can be either vaginal or anal)

2. Ideal for stimulating the g-spot or prostate.
Dude 1: Jill and I usually do it missionary, but yesterday we decided to mix it up and did it doggy.
Dude 2: Hell yeah, it's all about the rear entry.
by jacky_boy September 15, 2009
 
2.
anal sex, up the bum, driving on the dirt track.
i've got a tatoo on my arse that says no rear entry, because im not gay.
by krackpipe December 13, 2003