Not a Nice Word

When Carter and Carson were about 3ish, Carter told Chet to shut up one day after he got home from work. I don't EVER say that word so I was immediately embarrassed hoping that Chet didn't think I had taught them. I get very sad and tell Carter that that is not a nice word. I then ask him if he has EVER heard me say that? (that's what we always say when they say something inappropriate) He just sits there and I say to Chet that I DO NOT use that ever, and Carson says nope (as he stands up on the chair for major affect) mom says, "ZIP IT!" as he runs his hand with fingers pinched across his body like zipping a zipper sideways. I never even realized until then I even said that with that motion. The things kids teach us about ourselves!