fool around

fool around (third-person singular simple present fools around, present participle fooling around, simple past and past participle fooled around)

(intransitive, idiomatic) To engage in frivolous behaviour; to monkey around.
(intransitive) To waste time.
(intransitive, informal, idiomatic) To engage in casual or flirtatious sexual acts.
Jake has been fooling around with a married woman.
- 1975, Peter Benchley, Carl Gottlieb, Jaws, spoken by Ellen Brody (Lorraine Gary):
  Wanna get drunk and fool around?
(intransitive, informal) To engage in adultery; to play around.

to engage in frivolous behaviour; to monkey around (idiomatic)

Chinese:
Mandarin: 鬼混 (zh) (guǐhùn)

Xiang: 亂它 / 乱它 (lonn⁵ do²), 希望 (lonn⁵ do²)
Danish: tosse rundt
Finnish: hölmöillä (fi)
French: faire l'imbécile (fr), flâner (fr)
German: herumalbern (de)
Ingrian: hullussella
Japanese: ふざける (ja) (fuzakeru)
Latin: dēsipiō
Maori: whakarunaruna, porohīanga
Polish: wygłupiać się impf, pajacować (pl) impf
Portuguese: molestar (pt), encher o saco (pt)
Russian: валя́ть дурака́ (ru) (valjátʹ duraká) (lit.: "to roll a fool"), дура́читься (ru) (duráčitʹsja)

to behave in a thoughtless or irresponsible way

to waste time

English