Bad Santa

Willie T. Soke and his dwarf assistant Marcus Skidmore are professional thieves. Every year, Willie disguises himself as a department store Santa Claus and Marcus disguises himself as an elf in order for both of them to rob shopping malls at night, using Marcus' wife Lois as their getaway driver and accomplice. Marcus takes his duty as an elf seriously, but Willie is a sex-addicted alcoholic, and is gradually unable to appropriately perform his Santa duties with children, plus his safe-cracking performance is being affected, much to Marcus' dismay. When they are hired at the Saguaro Square Mall in Phoenix, the vulgar remarks made by Willie shock the prudish mall manager Bob Chipeska, who brings them to the attention of security chief Gin Slagel. Read more on Wikipedia.