In the context of the 2009 game Call of Duty: Modern Warfare 2, it refers to the style of gameplay associated with the use of the Marathon, Lightweight, and Commando perks (hence the acronym). Using them in conjunction gives you maximum mobility. Marathon lets you sprint endlessly, lightweight increases overall movement speed, and commando allows you to knife players from a great distance. Often used in conjunction with a tactical knife attachment for pistols, which roughly doubles/triples the speed at which you knife.

Some players object to the use of this, since it focuses on knifing rather than the core gunplay. Lag also favors the MLC user because they can potentially enter a room and knife someone before they show up on the victim's TV set (see how to kill a camper). MLC users are also frustrating to shoot at because they are such fast-moving targets.

Haters gonna hate.

In their defense, this is a very unsafe and wreckless form of gameplay, requiring you to charge head first at people with guns in an attempt to knife them. Kudos to anyone who actually does well using only his knife.

A very similar style of gameplay switches out pistol with tactical knife and commando, for a shotgun and steady aim (which makes hip-firing more accurate).

An older person caught in the act of having a mid-life crisis.

Mlc girls are stuck up rich bitches. They will go behind your back and are not to be trusted. They will throw themselves at any guy and always spam snapchat with the most irrelevant things. Attached to newington boys even though they don’t really care about them. Most gossipy school you’ll ever hear of, don’t be friends with MLC girls!!

A crazy ass crew that's down for their shit.
Don't Fuck with them.
Established in 2004 in the city of Carson.
Mucha Leche Clicka

Marathon Lightweight Command on Call of Duty: Modern Warfare 2.

A term that refers to a modern warfare 2 player that uses these three perks: Marathon, Lightweight, Commando. This trinity of perks is often used for running around the map and knifing the opposing team. Although a successful method and strategy, it annoys the hell out of everyone and is not the way the game should be played.

MLC players are also referred to as runners

known as being stuck up, two-faced shitheads that all the boys hate, all girls school that conclude of whores

merry little christmas, as in "have one", normally used in a more derogatory fashion, reserved for email or text messaging

Horrific school girls skirt lengths are highly innapropriate, vaping and smoking occuring, bullying across many year groups. My daughter absolutely dreads coming to this school every morning.