Personification gives human qualities to inanimate objects or abstract concepts. For example, "The wind whispered secrets through the trees" gives the wind the ability to whisper.
"Got a smart mouth" is an idiom, meaning someone is rude or disrespectful. It's not literally giving the mouth intelligence or the ability to speak, but rather a metaphorical way of describing someone's behavior.
However, you could argue that it *impliedly* uses a kind of personification:
* It treats the mouth as an independent entity capable of acting independently, suggesting a person's words are dictated by their mouth, not their mind.
* The "smart mouth" is characterized by its sharpness and rebelliousness, which are human traits.
So, while it's not a direct example of personification, it does use metaphorical language to convey a certain meaning and could be interpreted as a kind of implied personification.