godan verb (-ru)
play pranks; be mischievous
Casual verb for playful mischief or teasing, often used for children or light-hearted situations.
弟がまた茶目って、私の靴を隠した。
My little brother played a prank again and hid my shoes.
あの子はいつも茶目ってばかりいる。
That kid is always being mischievous.
Derived from the noun 茶目 (playfulness, mischief) with the verb-forming suffix る. The exact origin of 茶目 is uncertain, but it may be related to 茶 (tea) and 目 (eye) in a playful sense.