bitch gamer
A Gamer who bitches about game mechanics which they don't like. This often occurs when they encounter a strategy which they failed to consider, a character they view as overpowered, or a map they see as advantageous to the opposing team (Though none of these points need to be legitimately valid, as they tend to bitch about everything). 'Bitch gamers' generally have difficulty admitting they lost a game from being beaten fairly, often blaming anything and anyone they can before admitting fault.
"Have you played Starcraft with Martin, I countered his cheesy ling rush and crushed, I said gg, he called me a protoss powergamer... What a bitch gamer."