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"moon about" /"hang around"/ "fool around"

Question:

I know the meaning of "hang around" ,but unfamiliar with the rest two phrases,Could you tell me how to use them? And what else phrases have the simliar meaning?
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Moon around - similar to hang around but it makes me think of really aimless 'in-the-way' hanging around - like a hungry teenager in a kitchen.

Fool around means to behave in a silly way, to clown about, to mess about. Or it can also have a meaning of adultery (if you fool around behind someone's back it means you are unfaithful to them)
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Thank you very much!Emotion: smile
So you could say that 'fool around' is more or less similar to 'horse around' so frequently used by the main hero of Catcher in the Rye?