go hog wild
To behave in an uncontrolled manner, often due to excitement. The crowd had been cheering, but they really went hog wild once the lead singer took the stage. Your students will go hog wild if you never discipline them.
go ˈhog-wild(American English, informal) behave in an uncontrolled or excited manner: Just because your Mom and Dad aren’t here it’s no reason to go hog-wild.
See also: go