A girl who isn't a guys main girl. She's his down low girl who he just uses for sex and food
Wow she's so stupid for staying does she know that she's a side bae?
by Bd1234567890987654 December 7, 2013
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A person who is not in a actual relationship with those that are actually together but both companions know about this extra spouse.
That couple is together but that girl is their side bae.
by oohsococky January 1, 2015
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