typically applied to online first person shooter multiplayer video games when an occurance during the game doesn't coincide with one of the players interest due to any number of reasons.
losing player could say: "That last game was wacktacular! The connection to the server was slow and my whole team was noobs."
(noun)-To kill 4 or more people with a Plasma Sword in Halo 2 in rapid succession, can also be accomplished with a Brute Shot or any other weapon, but it is much more difficult.
Performing a whacktacular proves you are a top of the line player
Holy hell, I just overboarded every single one of those bitches with my sword, what a whacktacular!
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.