Top Definition
One who refuses to get their own FB account and instead uses their spouse of significant other's account. This allows them to truthfully deny having an account. This person uses the account to check up on family members and friends.
Sister: "Dad was on mom's FB account again! He grounded me because I cursed on FB."
Brother: "Yeah, he's such an Undercover FB User."
by Lolita75 January 12, 2010

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