m0dZ - modz - mods
'Mods' is short for modifications. Game mods are set of packed files made by gamers that change what the game looks like, for example it can change the futuristic weapons into those used in the second world war, it can change futuristic maps into those that look realistic. But mods can also make the game easier in multiplayer as some of them make weapons fire faster, or boost up players health and speed. This kind of cheating is usually taken care of by the game developers, however there are still some games that do not have anti-mod support. Those games include Freelancer, Red Faction and few more.
However saying m0dZ has nothing to do with modding, its like saying 'Look, i owned 20 guys with my knife, im having the skill like i was using a mod'