After any group or groups of persons, gay or straight, engage in anal intercourse, the man who's penis has been inside the other person's rectum, uses his now fecal covered penis to draw a picture, using the person's fecal matter, on his or her back. Sort of like a poopy game of Pictionary. The draw-ee, as it were, tries to guess what the draw-er is drawing.
"So check this out Bro, Josh and I were Brown Backing last night and he drew the logo for the Chiefs on my back! I totally got it before he was even finished! Brownbacking Kansas Governor Sam Brownback brown brown backing brownback
by Momma Rugburn February 12, 2015
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A pair of ageing and rarely laundered scads.

"I took my grandma to see Tom Jones the other night. She got carried away and slung her Yellow Fronted Brown Backs at the poor sod..."
by J Biscuit August 24, 2007
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A Brown Eye Back Fire is when you take a dump and when the poop hits the water in the toilet it splashes up on your butthole. It is the most disgusting feeling in the world that everyone you’ve ever met has experienced.
Guy on toilet: “(splash) AHHHHHHHH

Guy’s wife: “What’s going on in there?”

Guy on Toilet: “Fucking Brown Eye Back Fire.”
by K1LL_4_FUN March 23, 2011
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