A person so useless, worthless, and pointless that it's a shame they're taking up perfectly good skin some poor burn victim could be using.
See also waste of biomass,
waste of carbon,
waste of food, waste of life, waste of oxygen, waste of semen, and
waste of space, but oddly enough not "waste of makeup", which is mostly used by... wastes of skin.
"Yeah, I stopped seeing Joe after I found out he evicted his
grandmother from their duplex to rent it to some
strippers he met at a
titty bar. What a total waste of skin."