Refers to the expletive chain "hell-damn-shit-ass."
Easily fills a conversation gap with something other than the overused "F" word, and can actually act as a direct replacement in most circumstances.
Oh man I missed the finale of Lost, and DirecTV cancelled my DVR, and my internet was tuned off. HDSA!
What the HDSA are you doing with my girlfriend?
I hate, hate hate the HDSA out of Jim Carrey movies.