The melted, soupy leftovers of a hot fudge brownie sundae that was shared by three or more people at a national-chain restaurant.
No one at the table wanted to finish our dessert because all that was left was brownie backwash.
by FoodLuvr January 11, 2004
The slight taste of shit that one tastes when rimming the anus of another person.
I stopped eating his ass when I noticed a little brownie backwash.
by Mike Davidson December 28, 2003