Bum Wines

Puzzled by an expression I heard about a certain drink called Mad Dog 20/20, I discovered what the word hootch really means. And by that of course, I refer to bum wine. The technical term, if wikipedia is to be believed is low-end fortified wine, and wine here is probably a misnomer. From the sources I read on the net, these cheap chemical concoctions are made as a cheap product for the American homeless, which sure enough must be a very good business, getting better by the current administration. Some of these "wines" are even made by famous wineries, such as E and J Gallo, probably with the shittiest byproducts of their main wines, stuff that is not even suitable for making Grappa.