flip-flopper

The movement or sound of repeated flapping.

Informal A reversal, as of a stand or position: a foreign policy flip-flop.

A backless, often foam rubber sandal held to the foot at the big toe by means of a thong.

A backward somersault or handspring.

Electronics An electronic circuit or mechanical device capable of assuming either of two stable states, especially a computer circuit used to store a single bit of information.

To move back and forth between two conditions or circumstances, sometimes repeatedly: "The weather has flip-flopped between sweltering heat and violent storms" (New York Times).

To reverse a stand or position: "With the board having flip-flopped over zoning issues in the last several years, residents are looking to this fall's election for clarity" (Eugene L. Meyer).

To execute a backward somersault or handspring.