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The M16 is the standard issue assault rifle for the US military.

Manufactured by Colt, the M16 series fire the 5.56x45mm NATO round, which is accurate but lacks stopping power. It comes in safety, single, and 3-round burst trigger groups (except for the M16A3 which is automatic.) Auto fire was not used as it was deemed a waste of ammunition (and it usually is).

The original M16 was notoriously unreliable, due to low-quality ammunition, nagging issues with the ammunition feed, and the fact that the weapon was advertised as 'maintenence-free' (lol). The M16A1 introduced the foward assist, which was used to clear the front section of the gun in the event of a jam.

After Vietnam, new ammunition was developed, which required a modification to the rifling. This, along with other changes, created the M16A2.

Later, the M16A4 was adopted, featuring (among other things) full modding capability with Picatinny rails, which were already a feature on the M4A1.

Contary to popular belief, as long as you keep them clean the newer models of the M16 don't jam all that often. Also, unlike what someone else claimed, a good buttstroke with the '16 can ruin someone's day. It's quite a sturdy weapon.

The carbine version of the M16 is the M4 (burst)/M4A1(auto).
The Marines train to shoot with the M16 up to 500 meters.

"Now I'll just take him down with a well placed burst....Oh cripes, a jam!"
M-16 by KingRaptor August 21, 2005
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O in my M 

It stands for "orgasm in my mouth"
When something you eat is really really delicious you almost feel like groaning
Oh my god dude this ice cream was a total O in my M!!
O in my M by kajr January 10, 2009

I'm sorry, want a cookie? 

A phrase said in response to a completely pointless story in which one bitches about something nobody cares about.

Can be said either extremely and obviously sarcastically or with extreme concern. Both methods are fairly effective in making the victim look like a fag.
1. Stupid bitch's facebook status that's just looking for attention: Oh my god, I'm so ugly, my boyfriend hates me, my life sucks!

Any normal person: I'm sorry, want a cookie?

2. *Person rambles on 5 minutes about pointless story of how their life sucks*

Me: I'm sorry, want a cookie?
\ˈīm ˈbi-zē\

I have a priority list. . . You're not on it.
"Can you help me work something out? I really need a friend for a minute"

I really want to but I'm just so busy with work and school and family; I'm busy.
I'm busy by His Royal Majesty January 6, 2012

T.M.I. Scale 

A system of mathmatical equations for finding the actual size (not just the length) of a man's penis, as refered to on South Park.
Guy 1: Bro, i measured my dick and its an 8.3 on the T.M.I. Scale!

Guy 2: Nice dude.
T.M.I. Scale by Ryry March 17, 2012
A small cylindrical explosive device containing potassium perchlorate and aluminum, used to make lots of noise or destroy small objects.
Here's an M-80, let's blow this shit up!!
M-80 by Everyzig2101 December 23, 2003
A word used in the form of distress, or irritation. Use as if you’re about to complain but stop.
“ We’re taking two tests today in class, i’m-“
i’m- by WetTaco September 20, 2017