The phrase "did technicolor yawn" refers to a particularly vivid and colorful type of vomit. While the term itself is certainly eye-catching, there are several synonyms that could be used to describe this type of regurgitation. Some options might include "rainbow spew," "vibrant hurl," or "multicolored upchuck." All of these phrases evoke a similarly bright and intense image, and could easily be used in place of "did technicolor yawn" for a bit of variety. Ultimately, the choice of synonym will depend on the intended tone and context of the text in which it appears.