noun: a program that allows the player of an MMORPG computer game to leave the computer alone while his game character does menial, repetitive work. These programs are illegal, but widely used, because the kind of tedious labor they perform for you is quite maddening over time. A "macroer" is a player using such a program.
If you use a macro, you can mine coal without even being at your machine!
Heh, wasn't it funny when that macroer's axe broke and he just kept trying to cut down the tree?