A combination of the words 'meh' and 'so-so' Meso Meso uses both words to convey a feeling of mediocrity in mood.
"Hey Bob, how's it going?"

"Meso Meso. You?"
by Darkingfire January 11, 2012
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In Maple Story, the currency. You can get mesos from defeating monsters, a drop fest, or from trading.
I gained 10 mesos from that Snail. Wait. 10 mesos? 10 MESOS?
by MisaTange July 8, 2009
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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)
Masaru: Cough, cough. I thought you were a Meso.
Fuumin: What's Meso???
by maruree July 11, 2006
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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.

"Check out that meso! It could drop a tornado at any minute."
by SarahJS May 14, 2006
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Meso is a prefix that means in the middle or intermediate, it is in between Micro and Macro
Mesoderm, Mesoeconomic.
by DmytriKleiner September 5, 2005
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