Wiktionary
cellar dweller
n. (context US Canada Australia sports English) A team at the bottom of a league, or in a lower league.
Wikipedia
Cellar Dweller
Cellar Dweller is a 1988 horror film, about a comic book artist who unleashes a demon after drawing it. It was directed by John Carl Buechler, written by Don Mancini (as Kit Du Bois), and stars Debrah Farentino and Brian Robbins.