Some one who is a smooth talker
Mostly found as an expretion in high fantasy

Someone who's clever and witty, OR someone who's good with words.

Silver tongued:

Someone who has a way with words!

Is more used to define who has a clever way with words.Who has the skill to persue someone,or has facility to sweet talk woman.

is an expression used to describe a person who is able to clearly and effectively express themselves

someone who is good at cunnilingus (aka eating pussy)

A real expression that has nothing to do with sex and existed long before Metal Gear Solid, unlike the other definitions these idiots have put up.

Having a "silver tongue" refers to someone having exceptional skills with lingustics, most often referring to a powerful/influential speaker.