1.
If you ~, you behave in a silly way to amuse yourself or other people. (INFORMAL)
Stop playing around and eat!...
Had he taken the keys and played around with her car?
PHRASAL VERB: V P, V P with n
2.
If you ~ with a problem or an arrangement of objects, you try different ways of organizing it in order to find the best solution or arrangement. (INFORMAL)
I can ~ with the pictures to make them more eye-catching.
PHRASAL VERB: V P with n