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In the game Left 4 Dead 2, there is a pick-up item called Adrenaline. The Adrenaline Shot gives you a temporary boost of speed and health. When the character Ellis takes the shot he shakes himself awake which sounds like “WUBUBUBU”. This sound has caught on as a fad by fans and is similar to Grabbin Pills . The actual term “WUBUBU” was first used by Sn1pe, but the orginal sound is from the game.