adj. cool, derived from heroin slang. William Burroughs traces the etymology in Junky to heroin addicts, who carried paraphenalia on their hips and had (in the C19) laid on their hips on chaise lounges in opium dens. The original connotations involved sloth and anhedonia--themes that carry over into today's usage of the word (the too-cool-for-anything-you-have-to-say mindset).
Pete Doherty lives out the hipster lifestyle to its most literalized extremes.