flip-flap

Short definition from Wiktionary

Verb

1. 1
   To flop or flap about.

Noun

1. 1
   The repeated stroke of something long and loose.
2. 2
   A costermonger's dance.
3. 3
   A form of somersault or cartwheel.
4. 4
   A cracker.

Adverb

1. 1
   With a repeated flapping movement.