The smell of hair after 1-2 days without being washed. Gets progressively worse with each passing day afterward, until it becomes truly gag-a-maggot. The peculiar odor of hairstank is a cross between oil, dirt, sweat and stale shampoo / conditioner fragrance. Easily transferred to pillowcases and the inside of hats. For some reason, the smell of a dog that hasn't been bathed in several weeks, is not as unpleasant as human hairstank after only 3-4 days.
I love hippie chicks, at least the ones who bathe regularly and don't have crotchstank and hairstank.