Good call - I have told my little one that sometimes she will hear bad words but what goes on at footie stays at footie!!! I have heard her on numerous occasions waving her hands when the goalie is kicking doing the "yourrrr shiiitttttt arrrrrggg" but I have never ever heard her do it outside the Amex - and we sit in the North!!!
My 9 year old's version is "You're chiiiiiiiiiiiiiiiiiips aaaaaarrrrggghhhhh."
No, I don't get it either, but it works.