Sharking is when you hide in the ink and attack quickly after somebody gets near you.

Special farming is when you stick in the base and cover turf, just so you can get your special and use it on the other team.

Flick shotting can only be used for chargers. Sense chargers have a laser aiming at where they are aiming, people can see you when you're aiming. This is why flickshotting is so useful. In order to do it, aim in a random and unpredictable area, away from the enimy, then quickly look at them and snipe.