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1.
A woman who seems to have two periods/PMS in a month (perhaps due to a 21-day "cycle"?)

She's a bitch twice(bi) in one cycle
Fred: You look tired.
Ed: You have no idea! Remember around the 3rd when I said Mabel was PMSing all over my ass? Well, she's at it again!
Fred: It's still May, wehat is it, the 25th today?
Ed: Yea, lucky me, married a bicycle bitch!
Fred: Harsh, let's go drinking
by Cyberpope,Richmond,BC,Canada April 20, 2011