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

bro: who is jake dating, tara or ashley

bartender: both, he’s sideb-tching

donna: why are you chasing jake if he has a girlfriend
tracey: i don’t know, i’m just sideb-tching

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