screw around
Upper Intermediate (B2)informal
To waste time being silly or irresponsible, or to be unfaithful to a partner.
"The teacher told the class to stop screwing around and open their textbooks."
Hear it in context

Why is Everything So Boring Now?
Kurtis Conner · 15:45
Don't screw around.

How TikTok Hijacked the Future of Music - Nik Nocturnal
Chris Williamson · 115:38
They don't screw around.

SIR Debate: Beyond Voter Lists | Abhijit Iyer, Sushant Sareen & Charu Pragya on Mic Open
LawBeat · 19:44
You don't screw around with.

5 Times Jim Pulled the Jell-O Prank in The Office
The Office · 0:52
And you cannot screw around there.

Inside Jesse Jackson’s 1988 Presidential Campaign | Running with Jesse (full doc) | FRONTLINE
FRONTLINE PBS | Official · 44:52
He don't screw around with small fry.