The State of being cool. It is the very defintion of cool. Some signs of being Meggishh would be having changing hair, a two-faced personality, a pack of great freinds, and a bitchy mom. The word, orginating in Miami, Fl, is now common across malls in the area.
Person 1: That new bike is cool.
Person 2: Really?
Person 1: Ya, dude, its totally Meggishh