(someone) joke around

Translations
(кто-то) шутит, дурачится
He's always joking around even when the situation is serious.
Он всегда шутит, даже когда ситуация серьезная.
Definitions
To act playfully or humorously, often by making jokes, teasing, or not taking things seriously.
Words
someone

pronoun
кто-то
joke

verb
шутить
around

adverb
без дела