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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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It means to be gay or homesexual
Half the people on myspace are purple flags
by Sally Franklin September 23, 2006
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