Yes, the phrase ‘y’all come back now ya hear’ is indeed a colloquialism, particularly associated with the Southern United States. It reflects a friendly and casual way of saying goodbye while inviting someone to return.
In this phrase, ‘y’all’ is a contraction of ‘you all,’ commonly used in Southern dialects to address a group. The addition of ‘come back now’ emphasizes a warm invitation for the listener to return, while ‘ya hear’ adds an informal and conversational tone, almost like a friendly nudge to ensure the message is understood. Overall, this expression embodies the hospitality and friendliness that Southern culture is renowned for.