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Not British slang...it is from the 90's TV show "Newsradio". Secretary Beth decides to make up a word and see if she can get others to use it by dropping into every conversation. By the end of the day, everyone is using it. Has become popular in Britain due tothe popularity of the show.

It means to flip out or go a bit nuts, or to rant about something.
Beth went completely bitchcakes when she found out Matthew told Joe they were sleeping together.

Katherine is going to go bitchcakes on Bill after hearing that news story.
by BlooPenguin March 27, 2007
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2
crazy; bitchy; to become annoyed
Originated in Season 2 of News Radio. Quote:

Beth: If my boyfriend acted like that, I would go absolutely bitch cakes.
Lisa: Bitch cakes?
Beth: I just made that up. Think it's gonna catch on?

It hasn't.
by Jakob Harvey April 06, 2006
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4
An extremely attractive female, possibly bitchy and dominant; may attract to those of the bitchrake kind.
"The chick I was tiger-lilying turned out to be one heavenly bitchcake!"
by Dickcheeseburger! July 04, 2006
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5
When Joan's boyfriend didn't come home for 2 days, she went totally bitchcakes.
by kat August 13, 2003
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6
To go bitch-cakes is somewhat synonymous with to throw a hissy fit but crazier and with an implication of a physical outburst

Coined by Beth on NewsRadio
Beth: "If my boyfriend acted like that, I would go absolutely bitch-cakes."
by Kathryn January 18, 2004
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7
A distraction used to shut up a whiny little pussy (of the male persuasion)
God Trevor wont shut up about his window treatments... somebody give him some bitch cake so i can watch the damn game.
by Bitch Bakers July 01, 2004
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