flip-flap

from WordNet (r) 3.0 (2006)
flip-flap
    adv 1: with repeated strokes and noise; "something going flip-
           flap in the night"
from The Collaborative International Dictionary of English v.0.48
Flip-flap \Flip"-flap`\, n. [See {Flip}, and {Flap}.]
   The repeated stroke of something long and loose. --Johnson.
   [1913 Webster]
from The Collaborative International Dictionary of English v.0.48
Flip-flap \Flip"-flap`\, adv.
   With repeated strokes and noise, as of something long and
   loose. --Ash.
   [1913 Webster]
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