The thick, pungent left behind smells of a hot, sweaty, mungy ass sex session. Usually left behind in your room, dorm or car. A dead give away to the trained and experienced nostril like your mom's.
Although Carl told his mom he was doing homework with Cassie, the stanked up room was a dead giveaway that more than their lessons had been worked on.
Adjective of the word stank; a word used by East Bay thugs in the early 1990's. (ex. Will Smith). When put in front of a noun, it often describes a feeling of wrongness and awfulness.
Ed has been stankin' up dis place wit the most stankenist attitude. I'm really sick of him and his stankenist self. He so stanky.