"Ughy"

Lately when Lanie has been having temper tantrums or is frustrated, she yells, "ugh-ee, ugh-ee, UGH-EE!" at the top of her lungs.
Recently when she was yelling it, I said, "it's hard to help you because I don't know what ughy means." (Lanie is very verbal and has a huge vocabulary).
Sam looked up from what he was doing, "I'm pretty sure ughy is Lanie's version of the F-word mom."