monkey business

wildly playful or mischievous behavior the new nanny will not tolerate such monkey business from her charges Synonyms buffoonery, clownery, clowning, foolery, high jinks (also hijinks), horsing around, horseplay, monkeying, monkeyshine(s), roughhouse, roughhousing, shenanigan(s), skylarking, slapstick, tomfooleryRelated Words childishness, clownishness, foolishness, funning, jesting, joking, nonsense, silliness, waggery; boisterousness, rambunctiousness, rowdiness, rowdyism, rumbustiousness [chiefly British]; devilry (or deviltry), impishness, knavery, mischief, mischievousness, prankishness, rascality, roguery, roguishness, trickery; cavorting, frivolity, frolicking, gamboling (or gambolling), merrymaking, playfulness, revelry, roistering, romping, sporting, sportiveness