A nuclear equipped walking battle tank. Metal Gear Rex was held by the army, with legendary technology. The US marines later made use of Metal Gear Ray, which was amphibious, unlike the army's Rex. Metal Gear Arsenal was disguised as a rig in the middle of a lotta water. It was revealed to be more than just a weapon, containing nearly every piece of valuable information to the US government. It wasn't just a weapon, but the core of the country. It was guarded by a bunch of Rays. I don't know where the story goes from there, as I have not gotten Metal Gear Solid 3 yet.
Wow. It's a cool name that has been re-used for projects of killing machines and databases for the US government.
by blah December 26, 2005
Get the metal gear mug.
A bipedal tank, capable of launching nuclear missles from anywhere on the face of the planet. Its earliest incarnation was the Shagohod, a tank which, using rocket boosters and about 3 miles of runway, was designed to launch ICBMs. This was destroyed in 1964 during Operation Snake Eater. Metal Gear as we know it today surfaced in 1995 in Outer Heaven, ironically in use by the man who destroyed its earlier model, Big Boss. After being destroyed, another Metal Gear appeared in Zanzibar land. After Solid Snake destroyed it and killed his father, he retired, until 6 years later, the US government decided to build their own model, REX. Liquid Snake and the rest of FOXHOUND took control of the Shadow Moses facility until Solid Snake destroyed it. After that, various models began turning up around the world.
Metal Gear! It can't be!
by Snake March 15, 2005
Get the Metal Gear mug.
Any acts of shadyness/sneakyness or when you don't want to be seen.
"My ex-girlfriend is in the mall, I better Metal Gear my way out of here"

"That man in the trenchcoat standing on the corner looks very Metal Gear"
by MasterGecko April 24, 2009
Get the Metal Gear mug.
1. a phrace to make people feel awkward by coming un behind them and whispering it to their ear with a rugged many voice
*sneak senak senak*
"...Metal Gear..."
by 5n4k3_G33r March 20, 2009
Get the metal gear mug.
A nuclear-equipped walking battle tank also equipped with state-of-the-art conventional weaponry such as missiles, heavy machine guns, and lasers. It's main selling point was its ability to launch a variety of nuclear warheads toward anywhere on Earth from any location. It had the ability to more independently and instead of using a standard nuclear launch module, it was equipped with a weapon, which allowed it to launch a nuclear weapon with no external support. Since it could operate from regions, which were up to that point not on the world's nuclear strategy map, it was a weapon that destroyed the sensitive balance of nuclear deterrence and represented an enormous threat to the entire world.
You would really not want to be standing in front of Metal Gear Rex if it had a pilot who was unfriendly towards you....
by Solid Snake June 23, 2004
Get the Metal Gear mug.
*A massive bipedal tank (bipedal, as in, two-legged) equipped with state-of-the-art weapons, and capable of being equipped with a nuclear arsenal. Being bipedal, it is capable of launching a nuclear missile from ANY point on the face of the earth, from mountains to deserts to swamps, ANYWHERE.

*A verb, used to refer to dangerous intelligence-gathering, spying, espionage, etc.
"A Metal Gear would be cool in real-life, but imagine the dangers..."
-me

"I'm going to Metal Gear that guy's house."
"I'm going to Metal Gear the enemy base."
"That guy can pull off a Metal Gear with ease. ^_^ "
by Dave April 16, 2004
Get the Metal Gear mug.
the act of something being so gay or awesome that you randomly say METAL GEAR in a sentence
dude i just failed the test, METAL GEAR

dude i just pwned you, METAL GEAR
by afronaut01 October 26, 2009
Get the METAL GEAR mug.