A bandana worn in the left rear pocket of the pants. These are usually worn by gangstas, rappers, and people who are influenced by rap music. I've only seen blue and white flags, although I'm sure there's red flags too (maybe even other colors as well). The white flag can be seen in Eminem's music video, 'Just Lose it', and the blue flag can be seen in Snoop Dogg's music video, 'Drop it Like it's Hot'. Snoop Dogg says that his blue flag signifies that he is a crip, so it seems reasonable that a blood would wear a red one. If anyone wants to correct me, then feel free to do so.

Skaters can also be seen wearing flags. They usually wear black or white ones (although the color probably doesn't matter for them), and theirs is neatly folded into a triangular shape and only about four inches of it stick out, whereas the gangsta/rapper/rap-influenced person practically lets the whole thing hang out.
"I keep a blue flag hanging out my backside, but only on the left side, yeah that's the crip side" -Snoop Dogg, Drop it Like its Hot
by wcgold May 23, 2005
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"naaah - it'll be crap - let's flag it. "
by angela June 6, 2003
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when one takes a book into the bathroom while taking a shit and reads it (ex: that one episode of Seinfield)
Man, I must have taken the longest shit in the world last night. Luckily, I had Moby Dick in there with me. It's just too bad I flagged it.
by Krazy K December 22, 2002
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Word used for stamps in Prison. (i.e. a flag is often pictured on a stamp)
I'll give you 5 flags for the old issue of Buttman.
by Chris to the Izz-H December 23, 2007
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Flagged is to become a target(person or gang), for an example.
Yo, dawg. Did you hear that gangster disciple gang member down the street got flagged by OTM Mafia gang.
by 924_187 March 25, 2016
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To single out for attention and scrutiny.
Flag his personnel file, Mr Hoover, I think his cousin was a Bolshevik.
by harry flashman July 11, 2003
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to not do / want
alex - wanna go for a walk
mark - nah flag stay here and get baked

also
i can't be flagged isnsted of can't be fucked
by metaldread September 28, 2010
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