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Cusimonster 

A Cusimonster is a person who turns into a beast after drinking excessive amounts of Monster, Redbull, Venom, or Rockstars. A Cusimonster is a typically awesome person, just don't piss them off.
Person 1: Yeahhh, i drank a Monster--
Person 2: And you turned into a Cusimonster Right??
Person 1: Hellyazzzz!
Cusimonster by runnn! May 9, 2010

customonster 

A person who, because they are paying for something, feels they can treat service personnel like shit.
Oh, the customonster at table six keeps sending back her steak.
customonster by tomzone June 28, 2010