It's not something I would say to Attila the Hun during a pre-battle pep rally.
Some employers will not mind what color your hair is if your job location is not visible to clients or guests, or a funky hair color might be allowed to show school spirit at a dance or pep rally.
Plan out your chants and cheers ahead of the big game and consider teaching some ahead of time by doing them at a pep rally or printing the words on a flyer that announces the game details.
Have each class come up with a special cheer to perform during the pep rally.
Hold a pep rally to highlight the school's sports teams.