The currency of money in the game, MapleStory.

someone who is sexy beyond mean

A form of money in maple story

In Maple Story, the currency. You can get mesos from defeating monsters, a drop fest, or from trading.

Meso is the little "cute but suspicious" guy from the anime series known as Sexy Commando Gaiden or Sexy Commando, Sugoyiio Masaru-san!.
(See Sexy Commando Gaiden: Sugoiyo)

Short-form for mesocyclone. The Mesocyclone is the part of the thunderstorm that rotates and can produce a tornado. A meso can often be detected on radar or by seeing the wall cloud if you are storm chasing.

Meso is a prefix that means in the middle or intermediate, it is in between Micro and Macro