After having anal sex, the stink from the girl's ass that remains on your weiner. I've found that scrubbing with a brillo pad is the best way to remove said stink.
Yo Tressler how did last night go?
- I got some buttstank on my hangdown!!! EI EI
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi