Flip-flap is a colloquial term generally used to describe a quick and repetitive motion or sound. In the case of bird wings, it describes the motion of their wings as they take off and land. Synonyms for flip-flap include flapping, fluttering, and fapping. Other variants include swishing, beating, and waving. These terms all convey the same idea of a repetitive, alternating motion. When used to describe a sound, flip-flapping can also be referred to as clapping, smacking, or slapping. Regardless of the term used, flip-flapping is a playful and whimsical word that evokes a sense of airy movement and excitement.