muck%20about

verb

1. 1

   To do random unplanned work or spend time idly

   “Stop mucking about and get on with your work!”

2. 2

   To attempt to do something with a piece of equipment without understanding how it works.

   “Don't muck about with the video machine, or you might break it.”

3. 3

   To be playful; full of fun and high spirits; to not treat the situation seriously.

   “It was only a joke. We were only mucking about.”