A state of low, undignified quality; the result of slumlords occupying a single space, or slummin for too long.
"You're smoking that rain gutter water soaked cigarette? That's slummy as shit."
"The couch has been pretty slummy since Mike blacked out and peed on it."
Loose change, coins. (Liverpool, UK)
This machine only takes coins. Got any slummy, mate?