nobody's business 

A colloquial expression used in simile-like grammatical constructions to attribute particular force to the action of a verb. To state that something is happening "like nobody's business" suggests that it is happening with a particularly high degree of intensity.

It's raining outside like nobody's business!

nobody's business by Sam Sundquist June 27, 2005

Nobody’s Business

To do something well or to excel at something.

My little brother can pitch like nobody’s business. He struck out 6 batters in a row in the game yesterday.

Nobody’s Business by Breaking dancing on cardboard July 15, 2021

Like Nobodys Business

A phrase that is said to show emphasis to a statement.

That ho can shake her booty like nobodys business. She gets busy like nobodys business.

Like Nobodys Business by Sunshine1975 January 7, 2011