Freak-flag meaning
(idiomatic) Unconventional or unrestrained behavior; extreme, nonconformist views; the side of one's personality which harbors a tendency toward such behavior or such views.
noun
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Origin of freak-flag
- Reportedly from song lyrics for "If 6 Was 9" (1967) by Jimi Hendrix (1942-1970).
From Wiktionary