Where did THAT saying come from?(out of nowhere)

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This is somewhat inspired by a discussion I saw here earlier. I was out and talking with someone yesterday. While he and I grew up in the same State, we grew up in different areas. He would have had less exposure to other cultures and perhaps from other regions of the US. His accent is slower, with more of the southern twang that people associate the south with. I was raised in a more suburban and urban area. I found myself using sayings / colloquialisms with him that I had not used in awhile. Like "It ain't done it." It Ain't Done it is basically an exclamation of disbelief and / or surprise. I reckon came out a lot as well. I usually use I suppose more, but I reckon came out quite a lot yesterday. I almost laughed at myself because of how easy it was to slip back into this way of speaking. I could even tell that my accent became more hickish, and my speech slower. I'm not saying this is a bad thing... I'm just not saying it's good either. I don't know what to make of it.