Gnsr or GNSR is an acronym for "Gay Nigga Sex Rapist", describing a (male) person who is simoultaneously homosexual, of black ethnicity and a rapist. This term is mostly used jokingly to describe a black person who constantly acts very homosexually.
John: "Mark ordered a Long Black (type of coffee) and Tyrone told him that he would love to give him his long black.."
Clark: "Yeah, Tyrone is such a GNSR."
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.