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To fuck someone so good, they can't walk for a couple of days. Hence their back is blown out.
Boy: Damn, girl, I can blow your back out
Girl: Um, I don't think so, I have a soccer game in the morning and I'd actually like to walk.
Rough sex from the doggy style position.
Keisha has a fat booty. You already know I had to beat her back out.
To engage in sexual activity, usually in what is often referred to as "doggy-style," in a somewhat violent manner as to cause much volume from your victim, but much pleasure for both parties.
She screamed aloud as she lost her hip control while I was beating her back out
when you do it doggystyle and she cant walk the next day or two
I'll blow her back out
For the players who claim to fuck the shit out of a bitch
"I blew that hoe's back out"
Said about a sexually appealing woman, with whom you would be very eager to have sex.
To explain the metaphor: you may be a little too vigorous, and push your penis all the way through her, hence, knocking the back out of her... Obviously not physically possible, but a good, although rather crude, metaphor
Guy A: Phwoar, Check her out, what a stunner!
Guy B: God yeah, I'd knock the back out of that!
(V) the act of having sex in the position in which the receiving partner is laying down with back arched up, and the giving partner is entering from the posterior. (See also "face down, ass up.")
Damn, I don't care how much we been arguin, just blow my back out tonight.