Abbreviation for the medical term "Human Whiskey Dick". A common form of impotence among males of the species Homo sapiens sapiens. The first reported cases are lost to history but seem to correlate directly with the domestication of grains for the refinement of alcohol over 9,000 years ago. HWD strikes an alarming 90% of American males sometime in the early adolescence with sporadic flare-ups occurring on nights and weekends into their early 30s and beyond. 98.75% of all males can expect to experience HWD at least once in their life, more frequently if the male is a member of a Greek fraternal organization or a rock and roll band. Sadly, as of January 11, 2008 there is no cure for HWD and palative care is limited to rest, and the use of illicit drugs like cocaine or ecstasy.
Studies are currently being conducted to compare the correlation between Human Whiskey Dick and a similar disease "Weed Willy".
I've had H.W.D. off and on for over 7 years now. It's tough getting laid.