A sniper does not necessarily mean a gun itself. A sniper is basically a highly trained marksman. The proper word for the gun is a sniper rifle. Which is a very powerful rifle with a scope designed for snipers.
Noob: I'm going to buy that sniper. (he's gonna buy the person)
Other dude: No don't you mean a sniper rifle?
Noob: Shut up noob.
Other dude: ...
One who snipes with uncanny talent. Whether it be with bullets or sharpness of their eye, they are a step above the rest. With just a mere glance they can see the subtlest of details or shoot the hardest targets.
In gamer terms, it can also be seen written as
t3h 1337 $/\/ypr
Without even enough time to blink, the Elite Sniper shot the man square in the face.
"Dude, I'm gunna hide my cheat sheet in my belt, there's no way she will catch me!" "I wouldn't try it, I hear that teacher is an Elite Sniper."
Guy 1: Dude, that chick is bangin'!
Guy 2: I'd do things to her that would make a hooker think twice.
Conversation Sniper: She's not bad, but I think I would want to talk to her for a bit before hand just so I know I won't be stuck with some weird girl for the rest of the night.