Brown Trenching
to begin fooling around with a female then when the pants come off you unexpectedly find that she has a very shitty ass crack, it doesnt bother the male and he commences to have anal sex
Doyle: "Dude oh my god, the other night I got that girl from the bar back to my apartment and found out she was Brown Trenching."
Brad: " Oh god man that is gross... What did you do?"
Doyle: " What do you mean gross??!!??"
Brad: " Oh god man that is gross... What did you do?"
Doyle: " What do you mean gross??!!??"