(idiomatic, Southern US) To engage in idle conversational fantasies.
He said he was going to open a business next year, but I think he was just whistling Dixie.
"Sure is hot!" / "You ain't whistlin' Dixie!
Origin of whistle-dixie
- Refers to the song "Dixie", the traditional anthem of the Confederate States of America. The full implication is that the Confederacy would not succeed in the American Civil War through sentiment or token action alone.