also flimflam, 1530s, a contemptuous echoic construction, perhaps connected to some unrecorded dialectal word from Scandinavian (compare Old Norse flim "a lampoon"). From 1650s as a verb. Related: Flim-flammer.
flicker
flier
flight
flightless
flighty
flim-flam
flimsy
flinch
flinders
fling
flint