'Biis a gigantic black stickman who is a member of the Slush Invaders. He was placed in charge of guarding Standrew along with a team of Drabs. However, he was killed by an explosion when Westick, Joshtick, and Stick JK came to save Standrew.
Role in Movie
BigBoi appeared at the start of the movie to force down the door so that the Slush Invaders could invade Slusher. He was then assigned to guard Standrew, but ended up with a "fatal boo boo" after Westick and Stick JK shot him, and then got caught in an explosion as a result of friendly fire.
Role in Game
Spoilers [when edited in] follow, so be warned.
Spoilers end here.