When an individual has a 2 best friends and one of them is the oppsite gender, the opposite gender best friend is called OGBFF.
When a guy has a guy best friend but also a girl best friend, the girl is called OGBFF. Same for when a girl has a girl best friend but also a guy best friend, the guy is called OGBFF.
A: Are you and Mark together?
B: No! He's my best friend.
A: But, I thought Marrisa was your best friend!
B: She is! Mark is my OGBFF, opposite gender best friend forever!
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.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"