mess around
• behave in a silly or playful way.
• "he lay there snoring so I thought he was messing around and told him to get up"
• engage in sexual activity casually or with someone other than one's spouse or partner.
• "I found out he was messing around with my best friend"
• cause someone problems, especially by acting unfairly or indecisively.
• "get your own back—make him sorry he ever messed you around!"
mess around with
• meddle or interfere with something.
• "the minister messed around with health, and look at the state we are in"
