Top Definition
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.

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
The M4 is a modular assault rifle based on the AR-15.
Fires 5.56 NATO rounds, and uses STANAG magazines.

Two models:
M4, shoots in 3-round bursts and semi-automatic
M4A1, shoots in fully automatic and semi-automatic

Shares 80% of parts with the M16.

An offshoot of the weapon is the M416, which uses a different firing mechanism.
Squeaker: The M4A1 was used by every American guy in MW2, it must be a real gun.
(Searches on Wikipedia)
by Lord of the Chings February 17, 2014
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
achieves over 75% commenality with M16A2... but shorter range
by Dean August 04, 2003
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
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 20, 2003
Lighter virtion of the m-16
big shit
by prat October 02, 2003
Sandrine Tien
Yvonne Ho
Pauline Do
Tiffinie Pham
M4 is awesome.
by Alan Setthaboupha May 04, 2004
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