mess around with someone
mess around (with someone)and mess about (with someone) and monkey around (with someone)
1. in. to play with someone sexually. Those two have been messing around. He started monkeying around, so I got out of the car.
2. in. to waste someone’s time. Don’t mess around with me. Just answer the question, if you please.
3. in. to waste time with someone else. I was messing around with John.