It's a sentence from "The Adventures of Huckleberry Finn" after Mark Twain: "I never seen anybody but lied one time or another, without it was Aunt Polly, or the widow, or maybe Mary".
I have tried to figure it's precise sense out but I couldn't do it. Two different implications come to my mind.
- I had never seen anybody who didn't tell lies one time or another, but for Aunt Polly, or the widow, or maybe Mary (they were the only ones who hadn't told lies ever).
- I had never seen anybody who were telling lies, but for Aunt Polly, or the widow, or maybe Mary (they were the only ones whom I had heard telling lies).