Definition & Meaning of "do the technicolor yawn"in English

What is the origin of the phrase "do the Technicolor Yawn" and how is it used?

Do the Technicolor Yawn is a slang phrase that appeared in late 20th-century English to describe vomiting, often in a spectacular or messy way. The term comes from "Technicolor," referencing the bright, vivid colors used in old films, combined with "yawn" as a euphemistic nod to opening the mouth. Literally, it paints vomiting as a visually striking (and often colorful) event. Historically and today, it is informal and crude, used humorously or descriptively in casual speech rather than polite or neutral contexts.