A fork of Rural Dictionary
A characteristic, mannerism, or appearance of a person, either subtle or overt, which implies unique, eccentric, creative, adventurous or unconventional thinking.
David Crosby refers to long hair as a freak flag in his song Almost Cut My Hair. "I feel like letting my freak flag fly."
Movie Character Ben compliments Meredith in The Family Stone, "You have a freak flag...you just don't fly it."