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.

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

The act of pinching the tip of ones penis before ejaculation and then releasing, thus creating a powerful projectile of semen and targeted torward a femals eye, once landed, the man shouts "no-scope!"

A video game term. This is a skill that very few gamers can pull off, due to the inability to see the crosshairs on a sniper rifle without looking down the scope. You have to be very quick and confident to pull it off, otherwise, you look like a desperate noob.

When a student in your class tries to be funny but the teacher picks up to what he or she is doing and they get yelled at and sent out of the room and just hear a random "NO SCOPE!!" Out of nowhere.

The male act of urinating without the assistance of the individuals hands

Literally me on Battlefield 4 whenever I successfully one-shot another player without aiming