A person, who is socially awkward, posh and arrives on there first day of a new school with a briefcase or they own a briefcase.
Bully: Briefcase Wanker Briefcase Wanker: Ah yes, the bully of the school, your next jokes about me losing my virginity, well I lost it last night, ask your sister.
Bully: I don't have a sister
Briefcase Wanker: You will in Nine Months.
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?"