yuck a yum

This was the first time I've heard this expression (though apparently it is common), and after a brief mental moment of "huh?", it made me smile:
"I'd never yuck your yum".

It was in this Anna Akana video : When you and your friend are dating the same guy (ft. Julie Nolke)

Reading the video comments, some other viewers were likewise quite amused by the phrase, while others said they can't stand it. Which, if your exposure to the phrase was from a grade school teacher, I can understand.