> I have never tried to spell the phrase "flip a youey" before.

As a former Scripps spelling bee contestant, I've developed a low-grade allergy to commonplace onomotopeic words with no obvious, agreed-upon spelling. Recently I struggled with zhuzh (which has the bonus terror of having an alternate spelling, 'zhoosh') - but I commend OP for having chosen a phonetically parseable spelling over one of your (arguably more appropriate) choices, as I suspect it would have taken a lot longer to divine meaning from.