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1.
A Mapler is usually one who is addicted to the MMORPG Maple Story and plays it often. It was first used because Nexon used the term. It's often first said with a private server, for one who uses private servers a lot. Maplers often have something to really show their obsession over Maple Story, like having a plushie, or having a drawing of yourself in Maple Story form.
Maplers are so addicted to Maple Story.

BankaiMaplers are the most friendly Maplers!
by MisaTange July 08, 2009
 
2.
A person who plays MapleStory. Probably someone addicted as well.
Mapler 1: "I TOTALLY LOVE MAPLESTORY!"

Mapler 2: "IKR ITS SO RADD PLAY MOAR TONITE MEET UP IN HENESYS!!1"

Mapler 3: "YA GUNNA KS SUM N00BZ!"
by TomatoSauce July 28, 2008