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I-90 Special refers to road head, or fellatio performed on someone operating an automobile, specifically while on I-90 in the vicinity of Seattle, WA.

The term I-90 Special can also be used in the more general sense to indicate road head on any motorway.
Snoqualmie Pass was closed for blasting, so I asked her for an I-90 Special!
by I<3Oregon October 07, 2013
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