ИГРАТЬ В БИРЮЛЬКИ coll., disapprov.; often negative or infinitive with хватит, перестань

(те)

• to occupy oneself. with trifles (with the implication that one should be doing something serious, productive instead) – to fritter (fiddle) away the time
• fiddle (fool, putter) around
• waste one’s time on trifles. < From the name of an old game in which a large number of very small objects («бирюльки», jackstraws, pick-up-sticks) were scattered on a table and the players tried to pull out one otem at a time with a small hook without disturbing the other objects.