2)to disagree or to not comply with
kid 1- "what a corny fuck'n joke, boo that, boo this man."
Everybody- "boooooo. . .booo." (chop,chop,chop)
Kid 1- "Dude you shouldn't date that Chinese chick, you might get the SARS."
Kid 2- "Boo that, I've got the yellow fever, I need some China beaver"