Someone who thinks that just because they can quickscope in Call of Duty private matches, that they are amazing players, and can beat anyone in an online match or a 1v1 with anything other than the Intervention or M40A3. Quickscoping tryhards almost always have at least one of the following:
1) Turtle Beaches
2) A youtube channel that doesn't actually have any videos of them quickscoping on it
3) Some kind of capture card
4) A modded controller
5) Non-legit 9th or 10th prestige via 10th Lobby
Ryan is such a quickscoping tryhard, he thinks he's amazing just because he can quickscope. I'd kick his ass in a real match.