snoop (v.) Look up snoop at Dictionary.com
1832, "to go around in a prying manner," American English, "to appropriate," probably from Dutch snoepen "to pry," also "eat in secret, eat sweets, sneak," probably related to snappen "to bite, snatch" (see snap). Specific meaning "to pry into other people's business" is attested from 1921. Related: Snooped; snooping.
snoop (n.) Look up snoop at Dictionary.com
"detective," 1891, from snoop (v.).