Trickshoting in simple terms is a useless Call of Duty Modern Warfare 2 feat. "TrickShotting" involves one player climbing up to a high spot on a map doing a series of spins and weapon changes and then jumping off and getting a kill on a target that is usually standing still or on a VERY RARE occasion a moving target! After a Trickshotter performs a successful trickshot, it is followed by excessive screaming, moaning, and nerdgasms. The main point of doing this feat for them is becoming "FAMOUS" on Youtube which almost never really occurs. Trickshotting often consumes the lives of whoever does it usually resulting in the loss of friends due to the lack of socializing.
Go play some Modern Warfare 2 to see more on Trickshotting. ;)