A person with a severe alcohol/drinking problem. A wino has no regard for the quality of the swill he or she ingests, often becoming so incoherent that they begin to indulge in other vices they aren't normally known for such as smoking cigarettes or chewing cherry flavored tobacco by the tin. A "wino" doesn't care about their appearance and frequently can be found stumbling around shirtless and barefoot trying to start fights with passersby for no apparent reason. Any attempt to inhibit the wino's consumption only results in further consumption.
He used to be a learned Doctor but now he's just a dirty old wino who sits in the parking lot in a folding chair and drinks vodka until he fights his friend, throws up and passes out.