A phenomena in which when a group of nice, normal girls all turn into bitches because a bitch decided to socialize or spend time with them. There is no guarantee that the, initially normal girls will revert back to their non-bitchy selves after the after the initial bitch turns them into bitches. It can quickly spiral out of control so take extreme caution when you know a bitch is going to be at a social gathering.
John: God damn it ever since Lizzy met Cassandra she's been such a bitch.

Julia: That my friend is what the Bitch effect is.
by Suijinheki October 21, 2010
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When one white bitch start posting some dumb shit she doesn’t know but think it’s about equality or women’s right on instagram. It then leads to other white bitches joining her and reposting it. Hence the white bitch effect continues.
“Oh my god, did you see what Emily posted about Palestine?” “Yep, that’s the white bitch effect.”
by Leafs_in9 May 20, 2022
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When a guy pusses out, whines about everything, or let's his girl change his plans and he's okay with it. This diseases is very dangerous and tnere is no cure yet.
Bro His girlfriend wouldn't let him come snowboard and he's okay with it
Man he must have gotten sick with bitch effect
by Bitch effect 101 January 25, 2016
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when girls call other girls ugly, fat, etc. just because a guy complimented that other girl (i.e. - she's jealous)
GUY: Dude, that Catholic school girl is so hot... all i wanna do is get her in bed

GIRL: No, she's so ugly...

GUY: BITCH EFFECT!!!

by v8juice December 29, 2009
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