A toben is a haircut one can choose in the game of Maple Story. Having a toben in real life would mean you have an ugly bowl-type haircut where it seems you have been wearing a toque for a long duration of time. Having a toben can lead to being made fun of, being called ugly, etc.
Mehad: Dude, that guy's hair is so weird.. what is that?
Usman: It's a toben, I feel sorry for him.