If someone snoops on a person, they watch them secretly in order to find out things about their life. Governments have been known to snoop on innocent citizens. to try to find out about someone's private affairs by secretly looking in their house, examining their possessions etc snoop around/about (snoepen )
{i} one who snoops, one who pries or meddles; act of prying or meddling; private detective
If someone snoops around a place, they secretly look around it in order to find out things. Ricardo was the one she'd seen snooping around Kim's hotel room. Snoop is also a noun. The second house that Grossman had a snoop around contained `strong simple furniture'. + snooper snoopers snoop·er St Barth's strange lack of street names is meant to dissuade journalistic snoopers