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1.
One who creates maps, or game levels. A mapper uses software such as Hammer World Editor to create the world in which the game takes place, utilizing props, lighting effects, and a variety of textures.
Out of my development group, Jeff is the mapper, whilst I am the modeller.
by Pyth August 19, 2010
 
2.
A drifter. One who is constantly in travels, however, often retuning to familiar places of comfort. A teenage slacker.
It's hard for her to find motivation. She just lays around the house all day like a mapper.
by Teen Counselor November 28, 2007
 
3.
The ability to be constantly bugging someone, and no matter how hard you try to get away from the mapper, it still seems to be grabbing onto you.

Also, a mapper is sometimes a Party Pooper. It'll fight, and contradict you in almost every subject until the point where you just give up.
MAP ATTACK
Friend: "Oh man, I am so sore from work."
Mapper: "Oh yeah, try 3 hours of Rugby practice!"

Friend: "Aww, I have to go to work for ten hours!"
Mapper: "Oh yeah, I worked at the bigstop for 13 hours straight! I didn't even get to take a nap!"
by Friend of Mapper April 11, 2005
 
4.
fucking mappy jeff pike. he is so god damn mappy. sudden movements and heavy breathing.
Jeff Pike is so god damn mappy. "fucking mappy bastard!"-Phil
by friends of mappy April 09, 2005