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1.
a teamster;

a member of a teamsters Union;

a person who drives a team, a carriage or a truck for hauling, especially as an occupation;

a messenger of specific information to unite normally uncommon people or elements
Joe, another teamer within the company, said the benefits they provide outweigh it all.
We need at least ten teamers within these five cities to effectively reach our target market.
by a_real_teamer December 15, 2013
 
2.
When a girl sits in a room and one guy comes in and has sex with her, then he leaves and another guy comes in and has sex with her, and then another guy, and another, and another, and so on. The girl would be called a teamer.
At the party last night, she was a teamer.
by notateamer January 10, 2011