The Collaborative International Dictionary of English v.0.48:

Flimflam \Flim"flam\, n. [Cf. Flam.]
   A freak; a trick; a lie. --Beau. & Fl.
   [1913 Webster]

WordNet (r) 3.0 (2006):

flimflam
    n 1: a swindle in which you cheat at gambling or persuade a
         person to buy worthless property [syn: bunco, bunco
         game, bunko, bunko game, con, confidence trick,
         confidence game, con game, gyp, hustle, sting,
         flimflam]