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Having a particular looking hairstyle that doesn't pertain to the first assumption of a person.
"The Office worker had a Mohawk, therefore he had Rentzy hair."

"Chris Carraba's(Dashboard Confessional) Afro sure looks Rentzy."
by ifseventywereyoung November 28, 2003
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2
To have an unusual growth of head hair not incorporated with the first assumption of the person. Pertaining to Matthew Rentz.
The office worker had a mohawk, therefore his hair style was Rentzy.

"Chris Carraba's Afro sure look Rentzy"
by Vinnie November 28, 2003
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