mess around
US /mes əˈraʊnd/
UK /mes əˈraʊnd/

1.
perder el tiempo, jugar
to behave in a silly or playful way
:
•
Stop messing around and get your work done.
Deja de perder el tiempo y haz tu trabajo.
•
The kids were messing around in the backyard.
Los niños estaban jugando en el patio trasero.
2.
liarse, tener una aventura
to have a casual sexual relationship with someone
:
•
He's been messing around with someone from work.
Ha estado liándose con alguien del trabajo.
•
I heard they were messing around for a while before they got serious.
Escuché que estuvieron liándose un tiempo antes de ponerse serios.