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A way of exclamiing a lack of knowledge about a subject with a term of endearment.

Short for I don't know, fam. (Fam being short for family, used as a term of friendship).
Guy 1: Hey whats up with Dave?

Guy 2: Idk Fam, he's actin crazy.

Guy1: Hey man where did you put the basketball?

Guy2: Idk Fam.
by AFewBullets January 15, 2010
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