flimflam

Concise Oxford English Dictionary © 2008 Oxford University Press:
flimflam /ˈflɪmflam/ informal

▶noun

• 1 insincere or nonsensical talk.

• 2 a confidence trick.

▶verb (flimflams, flimflamming, flimflammed) cheat or deceive.

– derivatives
flimflammer noun,
flimflammery noun.

– origin C16: symbolic reduplication.