From Longman Dictionary of Contemporary Englishalley catˈalley cat noun [countable] HBAa cat that lives on the streets and does not belong to anyone
Examples from the Corpus
alley cat• I mercilessly left his fate in her hands; it was like leaving a goldfish in the care of an alley cat.• He may have the morals of an alley cat but raping a semi-comatose girl was beyond him. 