1. A car created in the mid eighties by Carrol Shelby and Chrysler designed for ultra high speeds with only a 4 cyl engine. The top speed was in excess of 194 miles per hour and 0-60 times of 4.1 seconds, from a 2.5l twin turbo engine producing 440 bhp. With a mid engine layout and near perfect 50/50 weight distribution, and a space age frame (much like we see in F1 cars).
The car was canceled after market reaserch showed, that people would not be willing to buy an ultra-high-tech-lightweight supercar, which was superior to many european super-exotics. Primarily because of its engine size 4cyl and that the pricetag which was roughly the equivalent of the Corvette.
2. A technological advance that is discarded because people are not willing to accept, or are not willing to purchase it because of its exorbent pricetag.
Guy 1: Man the PS3 is sweet!

Guy 2: Oh yeah but its $700 bucks

Guy 3: Just hope it doesn't go m4s.
by Tianyunwang April 8, 2007
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The U.S. Armys standard carbine, fires 5.56mm NATO round, shares 75-80% of the parts used in the M-16. For some reason ten year olds think they are qualifyed to operate and clean one because they use it in video games, and they read the wikipedia page on it.
If you look at most stock footage of the war on terror it will have an M4 in view.
by Burkus December 6, 2008
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1. A modular carbine used by police and military forces worldwide.

2. The cliche weapon of choice in first-person shooters.

3. The reason every prepubescent male in America thinks they know how guns work and how to correctly and accurately operate such weaponry.
1. The M4 derived from the CAR-15, an upgrade from the A1's used in much of the fighting in Vietnam.

2. Bob picked the M4 when he was playing Rainbow Six.

3.
Prepubescent male 1: dude we knoe everything about guns from playing video games
Prepubescent male 2: the m4 is a 5.56 NATO caliber carbine used by special forces and SWAT teams, it features an integral flash supressor with a fully modular design base including the rail interace system, a collapsable stock, backup ironsights, and room for a mounted foregrip, 40mm m203 grenade launcher, flashlight, laser sight, and a nifty carrying handle!
Prepubescent male 3: dude we should join the special forces were so good
by inbe July 27, 2005
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A 5.56mm (.223 Remington) assault rifle developed by Colt's Mfg. as a carbine version of the company's M16A2 assault rifle
The SWAT team's armory was filled with M4 Carbines
by JoeBob July 29, 2003
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1. M4A1 Sherman - A widely used American tank during World War II.
2. M4 Carbine - A short-barrel (carbine) version of the Colt M16A2 assault rifle. Used widely by law enforcement and special forces.
Hey, toss me that M4, will ya?
by SpaceMarine May 16, 2003
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A carbine version of the M16A2 assault rifle. It is a true carbine, being that is has a shortened barrel and a collapsable stock. Very popular with SWAT teams and Special Forces because of its light weight and customizability. Attachments include scopes, grenade launchers and laser aiming modules.
I pwned that T with ma m4, yo!
by Galloping Ghost June 5, 2005
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The main west bound road out of London England. It connects the capital with Bristol and the Welsh Cities of Newport, Cardiff and Swansea. Renowned for it's traffic congestion. Particulary around Bristol where it intesects the M5
...and again traffic is moving slowly on the M4, drivers are advised to seek an alternative route.
by black flag June 15, 2004
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