talking a lot; talkative person
Often used in a slightly critical or teasing way for someone who chatters or talks too much. Can refer to the act of talking a lot or to a person who does so.
He's a talkative person and is always chatting with someone.
If you talk too much during a meeting, you'll get told off.
Compound of 口 (mouth) and 叩き (hitting, beating), literally 'mouth-beating', suggesting incessant talking. The exact historical derivation is uncertain.