This idiom is perfect for describing someone who has a way with words, just like Obi-Wan in the example below. Plus, scroll down to the end of the post for another idiom with a similar meaning.
这些机器人，不是你在找的（這些機器人，不是你在找的 Zhèxiē jīqì rén, bùshì nǐ zài zhǎo de）
These aren’t the droids (robots) you’re looking for
天啊，它真伶牙俐齿（天啊，牠真伶牙俐齒 Tiān a, tā zhēn língyálìchǐ）
Wow, he’s really persuasive!
Depending on how it’s used this idiom might be seen as a bit negative – while it does have the meaning of being eloquent, it also has ‘smart ass’ connotations. In cases when you want to be sure your meaning will be received as positive use this idiom instead: