Dupe

[Sarah]

One who has been deceived or who is easily deceived; a gull;as, the dupe of a schemer.

[Sarah]

n. A [duplicate]
(rarely) v. To duplicate something

To deliberately [confuse] or [scam] someone

[Sarah]

To duplicate an item in an online game and ruin the virtual economy while bringing virtual personal gain.

[Tanya Shivari]

to deceive someone, usually by making that person do something that they did not intend to do: