The act of shooting someone with out using a scope or cross hare, usually only meaning something if it's a headshot. Therefore, there is no such thing as "no scoping" in Halo.

Generally speaking, the act of killing someone in a first person shooter game with a one shot gun (sniper rifle, bolt action rifle, etc) without using a telescopic sight or sniper scope. Most commonly, the term is used to mean that you fired such a gun from the hip and killed someone with it, however it can also (debatably) mean that you pulled up iron sights on a sniper rifle / bolt action rifle and then killed someone that way. The term does not apply to shotguns, semi-automatic rifles (unless they can be scoped), or any automatic weapon.

No scoping is generally viewed as an act of skill (or luck, depending on who you talk to and the mechanics of the game you're playing). This is because you are killing someone with one shot through a (usually) large crosshair and also risk exposing yourself if you miss. However, the amount of prestige that is attached to a single no scope depends on the distance and rate of success; i.e. if you no scope once and do this by killing a guy who you are literally next to, that doesn't take much skill, but if you continually no scope guys who are halfway across the map, that's some seriously good shit on your behalf. On a related note, no scope headshots get you some serious prestige if you can pull them off constantly.

The act of not scoping to kill an opponent.
Commonly used in Halo with a sniper but not limited to.

No scoping is NOT applicable to weapons where scoping is not required. ex. ak47, m4a1, battle rifle, SMG, etc.

verb: To snipe in Halo without using the scope.

A condensed clusterfuck fully directed into someones brain.

Killing someone without zooming in. Only works for Bolt-Action sniper ex. Cocking it every shot. Different from quick scope. No scopes are more luck then skill

when you shoot a sniper without aiming in and get a kill on any fps.

to shoot and kill an opponent in halo 2 with the sniper rifle without scoping, (usually close distance and lucky or skillful gh the xbox live headsetbut you can never tell unless you hear "omg, NO SCOPE" blasting through the xbox live headset).