when a girl is not exactly his girl. Someone who he treats as he should his girl but never commits to her. She usually feels like shit.
Cole: why don't you go with Tanner?
Me: Im just his side bitch....
its a term that gamers use at the end of arguing a point or just screwing around. It means 'good game, well played'
Tanner- awww, you thought you could beat me with your petty little mods and upgrades?
Dalton- *Dissapointed sigh* ggwp