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1.
The act of getting it on with a girl/guy from a country other than your own. The qualification is that he/she has to be born in the country you want to lay a claim to, and ethnic heritage from there is a plus.

Made popular by Roosh V, traveling author extraordinaire.
"I just got my Chinese flag."

"But dude, Li Lu grew up in Cupertino."

"Doesn't matter, she was born in Guangzhou."

Text sent at 3:56AM: "Chilean flag"
Text received at 3:57AM: "Congrats fuckface, i hate you"
by PeteP February 21, 2013
 
15.
When you do something wrong/bad and your girl catches you (used among football jocks) someone in conversation can reply by saying thats a (5) (10) or (15) yarder to give the other person a sense of how bad he screwed up
jock1: Emily threw a flag on me

jock2: what happend

jock1: I ditched her at the movies

jock2: Holy crap, dude thats a 15 yarder
by Jock059 January 07, 2010
 
16.
Among Midwestern Band Geeks: A Flag is a boy who is in the colorguard, and thusly minces around the football field...
Hmmm....did you see that Flag over there? Yeah he's a little too into it if you know what I mean.
by Cara Marie November 13, 2006
 
17.
A larger/chubby/obese/ fat person that acts or dresses like a slag. A mash up of fat and slag.
Girl 1: "Omg! Have you seen Katie today?"
Girl 2: "Why is she such a flag?!"

Guy 1: "Don't know what you saw in Becka mate she is such a flag!"
Guy 2: "I know, her legs were like tree trunks."
by GoodWithWords March 10, 2011
 
18.
to avoid something.
"naaah - it'll be crap - let's flag it. "
by angela June 06, 2003
 
19.
To single out for attention and scrutiny.
Flag his personnel file, Mr Hoover, I think his cousin was a Bolshevik.
by harry flashman July 10, 2003
 
20.
While carrying the enemy flag in Call of Duty 2, to run as fast as possible toward one's own flag without regard to enemy presence or one's own life.
Zach: Dude, I can't believe you scored that flag. You were running in the open with like three Nazis shooting at you.

Derek: I know! I was straight flaggin'!
by Zach Ceniti November 02, 2007
 
21.
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 22, 2005