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Noun. A hairstyle by trendy and fashionable people that, when it comes down to it, is just a mullet for rich people.

The Cosmo Mullet is most often sported by former hippies turned yuppies. You will especially see it on affluent, aging males trying to maintain a casual, carefree, semi-crunchy look.
Tom Hanks rocked the Cosmo Mullet in The Da Vinci Code
by Aaron Sagers May 10, 2006
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