4. Hax!
Really? Yes, its possible to manipulate the game by hacking, and I have found myself repeatedly killed by people jumping 200 feet in the air and spamming auto-aim. Thats one thing; crying "Hax" when someone is out-playing you is quite another. Its an excuse people are all too ready to use whenever theres lag its "hax," whenever someone kills you its "hax," and whenever something remotely unlikely happens its (you guess it) "hax." Depending on the game and server, hacking is usually regulated strictly and punished, so its nowhere near as common online as some people would like to claim. Its much more likely to be lag or chance.
3. Weapon Hogger
This is even more unreasonable than "Camper." It refers to someone who obtains a power weapon (such as a rocket launcher or a sniper rifle) and then keeps hold of it, using it to kill people throughout the match. Im not quite sure what the alternative would be, to be honest perhaps they expect you simply to play on, holding on to the weapon but nobly refraining from firing it. A rocket launcher has a fair amount of weight to it, after all; perhaps you could beat enemies over the head with it. Or use it to try to trip them over. Really, though, this is just one of those excuses that make me wince every time I hear it.