a sexual act deemed normally as unsavory or just plain fucked-up. i.e. foot-fucking, or in the eyes of some, anal sex. An extreme case would be barfing on somebody's chest, adding your semen, and scrambling it (see: Boston Scrambler).

Heinous acts of compassion are common in pornos, schock films, Amsterdam, and liberal arts campuses.
1:
"Dude Jordan fucked his girlfriend in the ass and then came on her and had her lick his shit-covered dick off!"

"Wow, what a heinous act of compassion..."

2:
"Are you ready for a heinous act of compassion"

"Sure, you can fuck me in the ass if you want"

"Uhh... I was thinking I'd ----- and --- midget --- egg beater--- and a huge cock ---- black men ---- 13 dildos ---- a rhinocerous ---- and then a jacuzzi full of pepto bismol --- and then we'd shave a cat ----- fungus --- and then I'd cum."

"Oooooohhhhhhkkkkaaayyy...."
by FHGWHGADS October 7, 2008
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