mess around

verb4

1. •
   (informal) To fiddle idly.

   • The kids sat there messing around with leaves and blades of grass because they were bored.
   • These guys don't mess around! They finished the whole job in ten minutes.
2. •
   (informal) To joke, kid, or play.

   • Hey, don't take it personally. I was only messing around.
   • Don't mess around with electricity if you don't understand it.
3. •
   (informal) To have a sexual relationship, especially one which is noncommittal.

   • Rumor has it that he's messing around with his secretary.
4. •
   (slang, old-fashioned) To dance.