When you're really good at call of duty, and people get mad. They feel the need to call you something that makes about as much sense as shitting on your dinner. They use the term "hard scoper" because as soon as they watch the killcam, they get ridiculously horny, or hard. This will occasionally be the cause for a premature ejaculation in one's pants.
Kid: WOW! you're such a hard scoper!
"Hard scoper": wait what?, i was using the ballistic knife?
Kid: *moan* aw shiiiiiiiitttttttt.