Often implies a person who is quick with words, sometimes with a negative nuance of being too smooth or talkative. Commonly used in the phrase 口八丁手八丁 (くちはっちょうてはっちょう), meaning someone who is both a smooth talker and handy with their hands.
He's a smooth talker and can speak well in any situation.
口八丁手八丁の彼は、営業成績がトップだ。
He's both a smooth talker and a skilled worker, and his sales performance is top.