Boston brownie 

The act of baking up a poo in the bowels and exploding it into the gaping anus of a small cat or dog preferably a boston terrier.

I walked to the shop and on route I spotted a boston terrier tied to a fence, i boston brownied it then carried on for my bread and milk.

Boston brownie by Boston brownie king June 12, 2021

Boston Brownie Batter 

Pooping in a clear glass bowl while it is over someone's face, giving them a view of the process and the resulting bowl of "brownie batter."

"Theresa showed up to the prom with a large glass bowl in the limo. I knew she was planning to give me some boston brownie batter later in the evening, and I just wasn't looking forward to it as much as she was."

Boston Brownie Batter by jackirose January 28, 2009