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.

Hey, do you have derp on that KV tank? No, I have the stock gun. Noob.

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KV

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.

Oh shit, a KV with derp gun on it. RUN!

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