To "get oystered" is when you get ultimately rekt from peeking a spot or getting one tapped in csgo. Normally occurs when you don't listen to your top fragger.
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"Don't peek it Kru$h! *Kru$h peeks it ~ get's one tapped* Haha scrub! Get oystered!"
"Peek it you won't! *Kru$h shoulder peeks it ~ awper lands the shot and kills him* Damn. He just got oystered. Oh well, at least he dropped an awp."
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.