Placing your partners head into a toilet (Similar to a swirlie) and fornucating with them doggiestyle after recently excreting feces into it. (BUT DO NOT FLUSH)
A wet brownie is a perfect way to make that prom night special, especially when you are forced to share a hotel room with several other couples and want privacy.
a mix between a wet willy and a dirty Sanchez
Jesse: Man that was fucking gross
Jesse: That dude just gave me a Wet Brownie