"Singing your head off" means that you are singing loudly and enthusiastically, you are really enjoying singing.
An idiom is something that does not mean what the phrase says literally, so yes. You can't actually laugh your head off.
It means what it sounds like. Or it can mean just plain and simply to kill said person.
To laugh a lot - the image is pretty self-explanatory.
don't be so angry with me ; its not that big of a dealdon't hurt me
what does it mean if you have a bump on your head
it mean your off your head
lmho-laughing my head off
Laughing my head off
It means laughing my head or laughing my head off
To cut off the head.
there mean they will bite your head off... What do you think sherlock?
It means took a sharp implement and chopped your neck until your head was no longer connected. Do you mean the idiom "bityour head off"? That means yelled at you severely, usually for no good reason.
It means laughing my head off
An idiom is something that does not mean what the phrase says literally, so yes. You can't actually laugh your head off.
It means that they are behaving in a crazy manner.
it means to shouted for no useful reason
bad luck