mess about

verb3

1. •
   To misbehave

   • Kids! Stop messing about and do your work!
2. •
   To play with; to toy with; to waste the time of (a person).

   • Stop messing me about and give me a straight answer!
3. •
   To be in a casual non-committal relationship

   • Anna and I are just messing about; this isn't going to last.