A word use to describe when someone usually an infant takes a crap and it gets smeared all over its back.
"That baby is a "brownback" since it got shit all over itself"
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A sexual act, preferred by Republicans in which loose stools are are rubbed on the back, over the eyes and in the mouth of one's partner while Fox News plays in the background.
Sam and Mary's children were turned off to heterosexual sex for the rest of their lives after they walked in on their parents brownbacking on the living room floor.
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The act of having unprotected anal sex using your partners fecal matter as luberication.
The governor of Kansas brownbacked his aide Jesus so hard he had poo splatters all over his desk.
Someone that stabs you in the back and then brown noses you to make it back up.
I just caught that brownbacker in bed with my little sister and now he wants to volunteer to buy refreshments for their next girl scout meeting.
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Anal sex with an ass so poopy you don't need lube.
I was brownbacking the governor of Kansas last night, and man did his shit stink!
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Area of fecal smearing in the lower back done by the penis during or at the end of anal intercourse, caused by the bottom partner a priori failure to clear their bowls.
After fucking her in the ass, I gave her a brownback.
While fucking my ass, he pulled out and gave me a brownback.
One of the benfits of double penetration is the possibility of instant double brownback - that's why you should try it!
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Noun: a man's anal cavern that has been smeared with feces after receiving anal sex.
Verb: to rub feces off of one's penis between the other man's butt cheeks and around his anus from which it was originally located.
Rick decided to give Sam a brownback after their session of passionate love making. While rubbing his cock in between Sam's buttcheeks, Rick felt santorum slowly begin leaking onto his shit covered, semi erect penis.