when something is stolen or taken without due process. often used to describe when one cockblocks a friend's chances at hooking up with an attractive woman to boulster his own reputation or stroke his own ego (see max). Also used to describe when someone deliberately plays third wheel to weaken one's chances at hooking up with a woman of intrest.
steve: hey dude, how did it go with that chick last night?
trevor: not good man, rod totally sniped me, he's such a tard.
trevor: hey man, did you and that chick hook up after we left?
steve: yeah man, rod tried to snipe me but she shot him down, we ditched him and got durt nastay!