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Acronym for "The Bitch Don't Know Who She Fucking With". Often used when a teacher or other person in "authority" screw up or piss you off in some other way.
*Sitting in English class*

Person #1: Did you finish the essay?

Person #2: Yeah, just barely though lol

Teacher: I was mistaken on the paragraph count for your essays. Instead of two body paragraphs it needs to be six. You have five minutes to add any paragraphs you may need before you turn them in.

Person #1: TBDKWSFW
by elite982010 June 23, 2015
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