flirt between man and women, but they don't have the serious relation.
Rachel fool around with Ricky yesterday,just for fun.
Also see hook up. To fool around: When two people, usually not currently in a relationship, find themselves kissing, participating in oral sex, and sometimes (but not always) can refer to having sex. Sometimes 'fooling around' is used when the specifics of a hookup are unknown.
Dave and Jenna were fooling around at the party.
Chris and I fool around in his car before he drops me off.