"Charmin' chatty" is an informal expression used to describe someone who is charmingly talkative. If you're looking for synonyms to express the same idea, you might want to use words such as affable, garrulous, loquacious, sociable, or verbose. Affable is used to describe someone who is easygoing and pleasant, while garrulous is a word used to describe someone who talks a lot, sometimes to the point of being annoying. Loquacious describes a person who is talkative, but the description has a positive connotation. Sociable describes someone who is friendly and enjoys the company of others. Lastly, verbose is a word used to describe someone who uses too many words when speaking or writing.
