JSD stands for Je Smud Den, wich is norwegian and basically means ok or cool
person 1: Lunch at 1
person 2: JSD!
by st.Uzi August 4, 2011
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An accomplice who doesn't fulfill movie going obligations, and then continues to experience the film with another friend.

JSD stands for "Jizz smelling dinosaur" often followed with "piece of shit" or cunt.
Friend: Wanna see Pineapple Express later this weekend?

JSD: I'll be unable to, work has been strenuous in the recent weeks and has rendered my free time obsolete.

Friend: Oh, well call me back if an alternative arises.

JSD: Absolutely.
by Billy Stickers III August 19, 2008
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