Off the dating market for heterosexual people; A homosexual.
Tova: That guy is so hot!
Eliana: I know! unfortunatly he's purple flagged.
Tova: Are you sure?
Eliana: He's in my theater class... with his boyfriend.
by Brown Eyed Girl May 29, 2005
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The action of calling someone on their bullshit. If someone tells an improbable story, just wave the imaginary purple flag.
"Dude, I had sex with three girls last night!"
*Waves flag* "Purple flag!"
by knotlock January 22, 2014
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