Simple past tense and past participle of snoop.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "snooped" in a sentence
"And a study commissioned by online gadget site Retrevo.com found that 38 percent of people under age 25 had "snooped" on their significant other's texts or e-mails."
"About 10% of that age group who "snooped" found their lover was unfaithful."
"And they should have "snooped" around camp themselves!"