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The Collaborative International Dictionary
To flap in the mouth

Flap \Flap\, v. t. [imp. & p. p. Flapped; p. pr. & vb. n. Flapping.] [Prob. of imitative origin; cf. D. flappen, E. flap, n., flop, flippant, fillip.]

  1. To beat with a flap; to strike.

    Yet let me flap this bug with gilded wings.
    --Pope.

  2. To move, as something broad and flaplike; as, to flap the wings; to let fall, as the brim of a hat.

    To flap in the mouth, to taunt. [Obs.]
    --W. Cartwright.