dupe Pronunciation (dp, dyp)
n.
1. An easily deceived person.
2. A person who functions as the tool of another person or power.
tr.v. duped, dup·ing, dupes
Though I would have thought it was an abbreviation of Duplicate
du·pli·cate Pronunciation (dpl-kt, dy-)
adj.
1. Identically copied from an original.
2. Existing or growing in two corresponding parts; double.