No it s slang. Idioms are phrases whose meaning you cannot figure out by context. If someone said you were crazy enough to belong in the booby hatch, you could figure out that it meant an insane asylum. Boobies are birds that are supposed to be very dumb.
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Boobies.
"To be" is not an idiom - it's a verb.
The idiom "apple shiner" means the teacher's pet.
An insane asylum, or mental institution. Also known as a nuthouse, macadamia ranch, booby hatch, etc... - Looney refers to being crazy or out of your mind. Bin refers to a cell. - The term is: You belong in a looney bin. This is saying you are a crazy person.
Pest is not an idiom. It's a word.