Top Definition
A person that spends excessive self love time in front of the mirror posing with their blackberry and taking pics!
Have you seen Elle's profile pictures yet on Facebook? The consensus by everyone is that she is a cosmo not!
by Don Samson December 01, 2009
1 more definition
5 Words related to Cosmo Not!
someone whose life revolves around getting extremely high.
"this cosmonot comes pigfishing for cape canavral every day"
by eddie ringer April 23, 2005

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