It means, well like insane; cuckoo; or in other words, your brain is out of order.
It means he is nuts, he is crazy, he is not normal
It means that you are acting irrationally or acting crazy. The image is of a machine whose rocker has slipped out of the groove and is now rocking madly and damaging the rest of the machine.
No, the word 'rocker' is not an interjection. It is a noun typically used to describe a type of chair or a person who performs rock music. Interjections are words used to express emotions or sentiments, like "Wow!" or "Oops!"
An idiom is something that does not mean what the phrase says literally, so yes. You can't actually laugh your head off.
Ripped off means you had something stolen. You were robbed.
you was close to something,you almost got it
Talking excessively, usually spilling secrets.
It means to fall asleep while sitting (or standing).
Old sailing slang meaning to be no longer in danger.
Nothing. The correct idiom is "get OFF your high horse," meaning stop acting so conceited as if you are above everyone else.
You are alot like you mother/father/brother/sister.
Worn out rocker nut?
Madagascar is not an idiom, it is an island off the coast of Africa.