Looming brown 

The urge/feeling KNOWING that you’re about to go #2 and are warned by the gas buildup pushing out as the last warning.

Tom Segura - “After a fudge baby birth my farts were relatively dormant and unless agitated by food, a looming brown was always good for several warning blasts until the log was dropped and subsequently cut by my urine.”

Looming brown by Doctor For Dictionaries March 31, 2022