1) Cartman 2) Driver 3) Trucker 1) Driver 2) Driver, often 3) Follower of Jimmy Hoffa 4) Haul of Fame candidate 5) Hoffa follower 6) Hoffa loyalist 7) Hoffa underling 8) Hoffa was one 9) Many a union member 10) Professional truck driver 11) Semi driver 12) Semi man 13) Striking worker, at times 14) Transport occupation 15) Truck driver 
A teamster, in modern American English, is a truck driver. The trade union named after them is the International Brotherhood of Teamsters (IBT or Teamsters), one of the largest unions in the United States. Originally, the term `teamster` referred to a person who drove a team of draft animals, usually a wagon drawn by oxen, horses, or mules. This.....
• (n.) One who drives a team.
Team'ster noun One who drives a team. 
[n] - the driver of a team of horses doing hauling 2. [n] - someone who drives a truck as an occupation
trucker noun someone who drives a truck as an occupation