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)
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.