So, you know that a group of cows is a "herd" (unless there are 12 or more, and then it's a "flink"*), a bunch of sheep is a "flock." and a collection of crows is a "murder." But did you know that a group of ferrets is called a "business?"
So when you hear that someone is "gettin' the bizness . . . "? That's right. They're being swarmed by a band of marauding ferrets.**
And if someone is all up in your business? Suggestions?
* "WTF?" is an excellent question.
**But not the black footed kind--they prefer to fly solo.