A nuclear equipped walking death mobile.Origanally designed to shoot down nuclear missles.For defensive purposes of course
LIAR! I already know that Metal Gear is nothing but a nuclear equipped walking death mobil!
by (insert name here) October 13, 2003
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Term applied to bipedal tanks, designed primarily to launch ICBMs from any point on Earth, thus rendering the concept of nuclear deterance moot, as well as eliminating the need for expensive silos or nuclear subs.

Metal Gears also serve the role of assault, artillery, anti-vehicle, anti-personell, escort, theatre-missile-defence, as well as numerous other functions with their heavy armaments. The numerous models over the decades have been armed with heavy machine-guns, rockets, hellfire missles, laser systems, rail-guns, hydro-cannons, and various other conventional and unconventional weapons.

In addition to carrying ICBMs, Metal Gears have been known to carry cluster-bombs, cruise missiles, and various other assault payloads in its missile tubes.

The Metal Gear is a fictional weapon-system.
No government has stepped forward for the nuclear attack, and no nation can be accused. NATO suspects that a Metal Gear was involved.
by Theorem March 3, 2005
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A gigantic nuclear capable bipedal tank. Designed to be able to launch a nuke anywhere on the planet thus giving its user an great advantage in undetectable first strike capability. Often terrorist seize these powerful weapons and have to be stopped by the player (Solid Snake, Raiden, Big Boss).

Featured in the games Metal Gear (MSX, NES, Commodore 64), Metal Gear 2: Solid Snake (MSX), Metal Gear Solid (PS, PC), and Metal Gear Solid 2: Sons of Liberty/Substance (PS2, Xbox), Metal Gear Solid: The Twin Snakes (GC) and Metal Gear Solid 3: Snake Eater (PS2).
"Metal Gear is nothing but nuclear equipped walking death mobile!"
-Solid Snake
"Now you shall bear witness to the demon weapon that will drag the world into the 21st century!"
-Liquid Snake
by Preacher January 29, 2004
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A gigantic walking war machine ;) Produced in many different forms such as Metal Gear RAY and Metal Gear REX. It appears in the Metal Gear games.
by Shotaneko-Kev September 28, 2003
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the full list of mg games that i know are: Metal Gear (1987) metal gear 2 (1990 I think) metal Gear Solid (1998)ghost babel (2000 I think) Metal Gear Solid 2: Sons of liberty (2001) MGS 2: substance (2002 for xbox and 2003 for ps2)MGS: the twin snakes, a gamecube remake of the 1st mgs (2004) and last but most definitely not least, MGS 3: snake eater. if the time sequence follows through, MGS 4- which is in production I've heard- will be out in 2007.
also see: most kick ass video game series of all time.
Damn that's alot of typing.
by Adrian December 11, 2004
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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
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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
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