mess around

I went up as him and was messing around with the voice a little bit, and people were eating it up.

“I am still willing to avert court action and have a sensible and amicable conversation with Newport City Council, but there has to be no messing around. They have to come and speak to me.”

“Because, listen here, sweetheart: We’re not messing around this time, and we will put your fat a** in prison for conspiracy against rights, and I promise you that.”

Here's Trump promising RFK Jr. "a good time" messing around with the public health system:

This was all developed and worked out, and by the time the World’s Fair hit, and the ’60s hit, he had a good eight or nine years of messing around, and now he’s blossoming.