@Intrepid,
I'll never be able to recapture the definition that I got. This one from the urban dictionary isn't even close.
hinky
the instant of knowledge when one becomes deeply aware that there is pure evil fuckery afoot.
She knew something was hinky when her husband returned from the store without his underwear...
My definition had to do with a guy in Vietnam, who alluded to a feeling that something is deeply wrong, but with a surreal...maybe inexplicable, supernatural twist. The first time I heard it used was by the homies in the State Mental Hospital...late at night as we were on watch of a really weird client.