What Does a Yellow Curb Mean?

Are yellow curbs universal? Does a yellow curb mean no parking in Abilene, or Spokane? It used to be mean that in MD, but they must have changed that to I'll only be a minute so I'm not parked? People are ignorant slobs, the only good people being the ones that read my blog! People of Baltimore, pay attention! Rules do apply to you, all of the time, even when you're in a a hurry! And you people that leave your car running with your kids in while you illegally park at an ATM are going to the 3rd level of hell!