Seen in most shooter games, typically first person. Either the target is well hidden, or the sniper really sucks, but both are at a deadlock.
Every other second or so a shot will be fired off, rarely hitting anything, as a warning or a weak attempt, just like an occasional spit in the target's direction (probably the namesake). That little bit of pointless assault is called spitting. No one is getting hurt besides the random lucky shot, and it's annoying as hell.
Sniper: Can I get some support out here? Noobert here won't leave his stupid cave, so I've just been spitting at him.
Target: Arrrg this camper has no life! He's been spitting at me the whole game!!!!