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1.
The act of ramming your finger deep into your ass, then stuffing that finger into someone else's ear.

The Brown Billy is the more hardcore version of the Wet Willy.
Todd was acting like a real bitch, so I gave him a Brown Billy.
by DickVanDice January 03, 2012
 
2.
A wet willy but in your butt.
My asshole was so wet I thought I got a brown Billy. I've been brown Billied.
by Danger City August 22, 2014