Verb fool around has 2 senses
  1. horse around, arse around, fool around, fool - indulge in horseplay; "Enough horsing around--let's get back to work!"; "The bored children were fooling about"
    --1 is a kind of play; joke, jest
    Sample sentence:
    Somebody ----s
  2. play around, fool around - commit adultery; "he plays around a lot"
    --2 is one way to cheat on, cheat, cuckold, betray, wander
    Sample sentence:
    Somebody ----s
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