noun
prankster; joker; someone who takes jokes too far
Osaka dialect noun for a person who loves to joke around, often to the point of being annoying or going overboard. Can also refer to the act of excessive joking.
あいつはいちびりやから、話半分に聞いといたほうがええで。
That guy's a joker, so you'd better take what he says with a grain of salt.
いちびりが過ぎて、みんなに怒られた。
He took the joke too far and made everyone mad.
Osaka dialect; the exact derivation is uncertain, but it is related to the verb いちびる meaning 'to fool around' or 'to get carried away'.