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3.
(UK) Member of the British Royal Marine Commandos.
(USA) Member of the US Army Special Forces.

"Green Beret" is the nicknames, because of their headgear. Which is a green beret, though this is moreso on the US Special Forces, than the Royal Marines.

Don't mess with either of those fucking elites though. The green berets = 10 seconds from pwnage (if you're a terrorist)
Yank: I was in the green berets, dude.
Brit: I was a green beret, mate.
by VirginityTaker69 March 01, 2008
 
1.
On the news, they are commonly referred to as "U.S. Army special forces", which is what they are. Green Berets are highly skilled operators, trainers, and teachers. Area-oriented, these soldiers are specially trained in their area's native language and culture. They train to perform five doctrinal missions: Foreign Internal Defense (FID), Unconventional Warfare (UW), Special Reconnaissance (SR), Direct Action (DA) and Combating Terrorism (CBT). They infiltrate and exfiltrate specified operational areas by sea, air, and land.
Green Berets, with the help of local militas, are chasing down drug lords in Columbia.
by Jason Chalupa July 08, 2004
 
2.
Common name used by people outside of the military to descibe one who is a member of some kind of Special Forces. Often used incorrectly and applied to many different special operations or elite military groups.

Only the Army has them in reality. Army "Special Forces" wear a dark green beret in the garison evnvironment.
My uncle was a green beret in Vietnam.
by genmatt February 15, 2004
 
4.
Really Bad Ass Soldiers that specialize in Airborne, covert operations. They Can be Engineers, Doctors, Communicatize and of course Infantryman! Don't mess with any of them! They can kill you with a sticky Note. They can take on entire Armies with just one Squad consisting of 12 guys. When they Get Angry they ram their heads into on coming traffic to calm down.
Fighting soldiers from the sky
Fearless men who jump and die
Men who mean just what they say
The brave men of the Green Beret

Silver wings upon their chest
These are men, America's best
One hundred men will test today
But only three win the Green Beret

Trained to live off nature's land
Trained in combat, hand-to-hand
Men who fight by night and day
Courage peak from the Green Berets
by SSg. Barry Sadler September 05, 2009
 
5.
Some of the best Americans/people in the world
A squad of Green Berets were trapped inside a shoe box in Kandahar province, surrounded by 300 members of Allah's Army of Hitlers in Headscarves. After a short firefight, all of the Muslims were dead.
by WBF April 18, 2013
 
6.
a hat...usually worn by US army special forces
Stop calling me a green beret...I'm not a hat.
by abc March 19, 2005
 
7.
When you're fingering someone and stealthily pick your nose, then continue with the booger finger(s) without cleaning it off.
I had a cold so I slipped her the green beret.
by DCreezy and JBreezy November 26, 2007