A lesbian friend of a married male who is picking up on random women in bars.
Man: "Hey, I'm a swinger, it's cool"
Chick: "Prove it"
phone call... Wing Bitch: "Hello?"
Man: "Hey I just met a girl, I'm gonna put her on"
Wing Bitcch :"Hey, treat my husband right. I'm totally down. Come over later and spoon if you want"
Chick: "Well, OK"
A term of endearment used between best friends in times of tomfoolery.
Erika, you're my wing bitch.