THANKS A LOT GIRLS NOW I GET IT ;)

Do you have kids who never listen? You could say to them, "Do I have to scream my lungs out before you'll listen?" You might be telling a story to someone "I screamed my lungs out and they still couldn't hear me" You might have had a bad day, so you take a walk to a quiet place and you scream your lungs out to get rid of your frustrations! hope that helps!

Hey Eduardo, to use this expression would be in a couple of situations. Your in a huge fight or argument and you were screaming your lungs out at the person. (or screaming your head off). Or your trying to get someone's attention who is a long way off and your screaming your lungs out hoping they will hear you. Or your in desperate need of HELP!!!!!!!! Hope these help :-)

Piece of cake! You scream your lungs (or your head) out when you scream at the top of your possibilities, leaving no air inside :) Like a crazy person lol Hope it helped!