fool around
US /fuːl əˈraʊnd/
UK /fuːl əˈraʊnd/

1.
brincar, perder tempo
to behave in a silly or playful way, often wasting time
:
•
Stop fooling around and get your work done.
Pare de brincar e faça seu trabalho.
•
The kids were fooling around in the backyard.
As crianças estavam brincando no quintal.
2.
ter um caso, flertar
to have a casual sexual relationship with someone
:
•
He was accused of fooling around with a colleague.
Ele foi acusado de ter um caso com uma colega.
•
They were just fooling around, nothing serious.
Eles estavam apenas brincando, nada sério.