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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