It's when you get gangreen on your penis. It's disturbing and probably means you will never get laid again. Also, don't even try to get a boner when you have it. Sadly, chopping it off is the only way to get rid of it. I do not know how you would get gangreenis, except if you were buck naked and running through antarctica.
I hope I never see that guy's gangreenis again! It ranked in the top 5 of most disturbing things I have ever seen!
str8 ghetto, pickin cigarette butts out of the ashtray outside at the bus station downtown, trading link card for beer or possibly butter...donating plasma for saturday night beer money, no furniture in the front room (guess ya sold it too)
hey, imma smoke this cigarette butt from your ashtray is that cool?