Definitions by SiemaUSA
Derp
From the Online multi-player game, World of Tanks, it refers to the biggest and most explosive slowly reloading gun that one can have for a particular tank.
it is an acronym for Kliment Voroshilov, which were a series of heavy tanks created by the Soviet Union during WW2. Several of these tanks are used in the game World of Tanks. It's powerful but extremely slow.