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The friendship where you and (a) friend(s) are best friends one day; laughing, talking, hugging, sharing secrets, and the next day you are crying from all the fights you've been having.
Fighting consists of:
Shit talking
Bitch Slapping
Rude Behavior that offends others (racist, sexist, biogtry, YO MAMA jokes, etc)
Bipolar friendships are common among females.
Henry: Hey, you and Mandy comin' to the party tonight?

Giselle: Nah. We're not talking. Girl doesn't know how to keep her mouth shut.

Henry: *sigh* Bipolar Friendship.
by Nanyy June 18, 2011
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