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When a person has intercourse with their 2nd cousin.
Bob was 'whistlin' dixie' with Carol last tuesday.
by Handjula December 05, 2008
To be speaking in jocund terms about something more serious. To speak of something in a manner less serious than it should be, while still maintaining the adamancy of your beliefs.
Mike: Those FAMU boys actually think it's their right to have homecoming in this town again this year.

Josh: Boy, you ain't whistlin' Dixie.
by fsudixiecrat December 11, 2010