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A way of combing your hair in the back. Instead of combing your hair straight down in the back, you would comb both sides in towards the middle and then, with the end of the comb, part it down the middle.

Also known as a DA, Duck Tail, or rarely a Duck Butt.
The Fonz always wore his hair in a Duck's Ass on Happy Days.
by OneBadAsp October 24, 2006
Phil Mickelson-esque hair, or when the tail end of your half mullet flips up when you style it or wear a hair.
Check out Phil Mickelson's duck's ass. It's epic.
by Communicator21 March 11, 2011