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Acronym for "Shit You Don't Need"*
Used to pejoratively refer to anything that that can be regarded as useless, overpriced, a fad and generally all that is related to consumerism.

*Yet to be accepted by the internet community.
Jimmy: Have you seen the new iPhone?
Michael: Yup, such a sydn!
Jimmy: What?!
Michael: You noob!
by equilibrium2x July 17, 2007
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