You monkey around with something when you do not know what you are doing.

VOA: special.2011.03.13

What are other people doing, what can you do?"

VOA: special.2009.03.25

"Who are you?" "What do you want?" "Why are you doing this?" James, let's not play with our food.

VOA: standard.other

"And what incentive programs do is make it more favorable for you to overcome that tendency to procrastinate doing something now."

VOA: standard.2010.07.16