Stop bothering me, stop pestering me, stop nagging me.
If someone tells you to get off their back, it means to stop bothering or nagging them. The image is of them right behind you, nagging.
You could also get someone off of someone else's back, which means you help that person to get rid of nagging or bothersome people.
The idiom will u please get off my back means stop bugging me or leave me alone
The meaning of the idiom "to slap the back off you" is fairly straightforward. It implies an exaggeration, that one would slap someone else so hard that their back would come off.
Madagascar is not an idiom, it is an island off the coast of Africa.
the idiom of really upset is "pissed off"
"To be cheeky" IS an idiom. It means to sass or talk back.
Like water off a duck's back means unfazed, taking things in stride, unbothered.
to try new things
'Pulled off' means accomplished, and to put something on the 'back burner' means to reduce its priority. Therefore the sentence 'pulled off at the back burner' does not make a huge amount of sense. But, it is possible that the person who said it may have meant accomplished something that was not high on ones list of priorities.
Idiom - Back to Square One: Back to the beginning.
"Chip off the old block" IS an idiom! It means that the child is just like the parent.
Get back in the saddle.
An idiom is something that does not mean what the phrase says literally, so yes. You can't actually laugh your head off.