gull 2 (gŭl) n. A person who is easily tricked or cheated; a dupe. tr.v.
gulled, gull·ing, gulls To deceive or cheat.
[Probably from gull, to swallow (obsolete), from Middle English golen, to pretend to swallow, from gole, throat, perhaps from Old French goule; see gullet.]
c.1430 (in a cook book), probably from Brythonic Celtic, cf. Welsh gwylan "gull," Cornish guilan, Breton goelann; all from O.Celt. *voilenno-. Replaced O.E. mæw.