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To strike a person who has general douche-ish or hipster-like qualities.

To place one's hands in a palm-to-palm fashion (similar to a duck beak) and jab one's opponent in the neck or other sensitive area.
If you don't shut up with your plaid pants and guitar hero singing, I'm going to duck punch you in the sternum.
by AtotheCtotheE September 14, 2009