Definitions for play around
play around, fool around(verb)
"he plays around a lot"
dabble, smatter, play around(verb)
work with in an amateurish manner
"She dabbles in astronomy"; "He plays around with investments but he never makes any money"
Kernerman English Learner's Dictionary
to behave in a silly or irresponsible way
Stop playing around - this is important!
To behave in a silly, or childish, or irresponsible way.
To work with in a non-serious manner
To engage in sexual practices outside of marriage.