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Brown Battery 

When two Males are having anal sex the penis is called the "brown battery"
"Did you hear about Kevin and Matt? He was talking about his brown battery. Kevin called Matt the Energizer Bunny!"
Brown Battery by whizkidddd February 9, 2013

Buttery Brown-out 

The act of performing a Rolling brown out on a girl while lathered in butter. This will result in a faster transition time for the surprise dump.
"Man, I can't believe Ansel actually pulled off a buttery brown-out."

"Yea I know. I think his mom taught him how to do it."
Buttery Brown-out by joebloww October 31, 2014

brown batter 

When you take a shit and its liquid and poors out like, cake batter out of a mixing bowl.
Your mom must be making a cake in the toilet, judgeing by the brown batter.
brown batter by Matthew Kibby December 13, 2006