ZRBTT

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ZRBTT, also spelled zerbet or zerbert, is a term coined by Bill Cosby's character Heathcliff Huxtable in an episode of The Cosby Show. (In the original episode, the spelling was explicitly given as "Z-R-B-T-T".) It is described as the act of pressing one's lips on a soft area of another person's flesh, such as their facial cheek, and blowing, producing a noise similar to that created by flatulence. It is similar to Blowing a raspberry or a Bronx cheer.

A ZRBTT has also been called a "blowfart".