smo

A person who is mean for the sake of it, usually without reason or intent, but is mean anyways. Smos can be classified further into "bosmos" and "prosmos," depending all on their relative smo-ness.
Very different from a "mo," which is just a smo wannabe.

Izzy: Hurry up! Its psych!
Kevin: Oh my god you smo, you're not even waiting...

by bcut January 04, 2009