M4

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 06, 2008
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m4s

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 08, 2007
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M4

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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M4

New kids at the school, first years, naive young student that U4s and above may laugh at and bully for their entire first year before they are accepted into the college.

Bottom of the school heirachy, annoying M4s should be bullied in boys case and bitched about in girls houses, until they are properly behaved.

Sucking up to/ making friends with M4s is forbidden in their first weeks at school.
Wow the M4s this year are arrogant, as always.
by EpsomBanter August 29, 2010
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M4

An extremely powerful assault rifle used by special forces and the U.S. military; it uses the 5.56 mm round. An M203 (grenade launcher) can be attached under its short barrel to cause maximum damage and doom. It is black with pink polka-dots and a lot of naked lumberjacks use them. Lumberjack slams are also delicious. They are eggs, ham, bacon, sausage, pancakes, and parsley. They taste slammingly tasty.
That stupid asshole was running down the hill when he tripped on a rock and the M4 Assualt Rifle he was carrying went off and shot a mailman.
by Borg November 28, 2004
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M4

Members:
Sandrine Tien
Yvonne Ho
Pauline Do
Tiffinie Pham
M4 is awesome.
by Alan Setthaboupha May 04, 2004
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M4 FEHEEEM

A state of great confusion where your voice becomes sqeaky
MR !
I AM M4 FEHEEEM!!!
by zinhumxenon January 28, 2019
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