snoop /snuːp/noun 3verb 3forms 3phrases 2 noun3 •The act of snooping. •One who snoops.Be careful what you say around Gene because he's the bosses' snoop. •A private detective.She hired a snoop to find out if her husband was having an affair. verb3 •To secretly spy on or investigate, especially into the private personal life of others.If I had not snooped on her, I wouldn't have found out that she lied about her degree. •To be devious and cunning so as not to be seen. •(slang, old-fashioned) To steal.'What on earth do Coker and his parcel of tuck matter to us? You're not thinking of snooping his tuck, I suppose, like Bunter.' — 1956 formssnooped · snooping · snoops Phrases with snoop snoop aroundTo snoop. snoop outTo find out by snooping; to discover.