from The Century Dictionary.
- noun A repeated noise made by blows.
Sorry, no etymologies found.
The "Yurchenko" is a "roundoff flic-flac into a backward 1 1/2 salto with a 1 1/2 turn."
She began with a roundoff and "flic-flac," a leap backward to the hands and back to the feet.
a soft _flic-flac_ the great night-moths were flying round the wire-gauze cover, alighting, taking flight, returning, mounting to the ceiling, re-descending.