1. Mock fighting or wrestling, horseplay, slapping, or grab-assing, usually indulged in by immature boys.
2. Adults who evade work responsibility by indulging in tomfoolery or idle socializing when there is work to be done.
3. Current euphemism for "have sex," having replaced "make love" about 25-30 years ago. "Fooling around" connotes sexual foreplay which may or may not lead to deliberate intercourse depending on the couple's tradition and current opportunity.
2-"The phone was ringing, and where were the front-office employees? In the break room, fooling around as usual."
3-"There's nothing on TV and the kids are asleep. Feel like fooling around?"