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1.
A person who snoops unharmfully and unintentionally.
Your neighbor is staring right at us! Oh don't worry about him he's just an old schnoop.
by beb. October 22, 2007
 
2.
To have sexual relations of any kind, possibly in a covert and/or sketchy fashion.
I heard Megan was trying to schnoop Andrew.
They were schnooping each other last night on the mantel.
by AM12 August 29, 2008