When you and your lover are standing at least knee-deep (but no deeper than waist-deep) in a body of still, stagnant water (a swamp or bayou is preferable), and one of you makes a buoyant bowel movement in the water, and floats it over to the other as a gift-- the way one would give another a freshly-baked brownie.
"Here, I've made you a fresh bayou brownie! Enjoy!"
by Nicholas Womp June 9, 2007
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The dead skin scrappings collected from the grundle or taint/asshole region after a long run in the heat of summer. Swampass is the number one culprit for these God forsaken brownies.
Bill: I just went for a 10 mile run in this Louisiana Bayou death heat wave.

Mark: You better go scrap yourself clean of all the Louisiana Bayou Brownies bro.
by Csmasher May 19, 2011
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