[vomit color]Are these onomatopoeic?[/vomit color]

I've long thought that "RALPH" was, but I can't hear the onomatopaea in 'YUCK" or "Eeeewwww," though the latter does sound similar to the sound of air escaping from one's lungs as an involuntary reaction to revulsion. Didn't we have a thread on all the different uh - ewwwwphamisms - for reverse peristalsis?