It's an alternative way of saying "What's up?"
Origin "up a storm"
Each idiom has its own origins - you'll have to look up the etymology of every one separately.
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To be exposed
It was a custom to plant daisies over the grave of a loved one.
No
Palestinian and Persian
affrica (iraq
grab a bite
It was in 1960 in America
It is just an idiom and has no history.
food