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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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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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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Short barreled butt hole blasting machine. Fires the extremely deadly 5.56mm round. Kills motherfuckers dead
"we drove by and hit his ass with the twin m4's, dropped 4 mags into his house and the bitch just strait blew the fuck up, it was crazy shit"
by matt June 21, 2003
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achieves over 75% commenality with M16A2... but shorter range
by Dean August 5, 2003
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One of the worst guns ever used.
Dude1:Look at my m4 it rocks!
Dude2:my ak is better.
Dude1: no its not : <--- sad cause he knows its true.
by The Dude92 May 12, 2009
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A state of great confusion where your voice becomes sqeaky
MR !
I AM M4 FEHEEEM!!!
by zinhumxenon January 28, 2019
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