1. The act of having a two girlfriends at the same time without them knowing about eachother
2. When a girl tries to start a relationship with a man she knows is in a committed relationship
1.
Bro: Who is jake dating, Tara or Ashley
Bartender: both, he's sidebitching
2.
Donna: why are you chasing jake if he has a girlfriend
Tracey: I don't know, I'm just sidebitching
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like a sidekick to a complete bitch.
She's like Leah's total SIDEBITCH.
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