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A slang term used on the internet to mean "just fucking don't know"
hey man, you going to the party 2nite?
dude, im in so much trouble, i jfdk
by BMW32590 June 04, 2010
Just Fucking Don't Know - shorthand for a decision with no clear, right answer
Ex 1. The store left one of those anti-shoplifting magnets on my shirt. I think I'm going to have to cut it or tear it out eventually. JFDK...

Ex 2.

Jim: Hey man, you going to the party 2nite?
Steve: Dude, I'm in so much trouble, I jfdk.
by Thusday June 04, 2010