fool_around
1. [ verb ] indulge in horseplay
Synonyms: arse_around fool horse_around
Examples:

"Enough horsing around--let's get back to work!" "The bored children were fooling about"

Related terms: play joke
2. [ verb ] (sexuality) commit adultery
Synonyms: play_around
Examples:

"he plays around a lot"

Related terms: cheat_on