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1.
Backstabber, someone who betrays his allies. Mainly in games like Starcraft.
Red: OMFG BLU ATACKED MEH!!111!!
Blue: No, that was the computer!
*Player 1 has been defeated*
Red: DEN Y IS IT STIL ATACKIN MEH!!!
Blue: Umm... >_>
by Jakeling July 01, 2004
 
2.
One whose primary goal is to bullshit
That ain't true... you friggin bser
by phat_tony March 07, 2005
 
3.
A person who backstabs (kill your allies)
Red:blue wtf r u doing to my pesants?
Blue:GOOSED U NOOB! ROFL MESA BEIN PWNING U LOTS TODAY!
by davemaster444 June 24, 2005
 
4.
Brown Supporter. One who supports people with brown colored skin, such as Native Americans, or Latinos.

A white person, who hangs out with a group/clique of darker or "browner" people than he/she is.

Not particularly a wannabe or a cracker.
Politician: I don't think we should prevent the illegal immigration of Mexicans.
Citizen: Dude, he is such a BSer.

Did you see that white kid in that group of Mexicans? He must be a BSer.
by JonStratford June 10, 2010