깝쳐

Acting up, getting cocky, or being annoyingly playful when you shouldn't be. From 깝치다 (to act out / show off). Used when someone is pushing their luck, getting too big for their boots, or just being irritatingly cheeky.

깝쳐 = acting up, showing off (from '깝'치다, to act cocky/playful)

See also: