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1.
The term used to define a battle between at least two videos from one or multiple sources on a single webpage (a mash-up). A winning video can be selected by users via either a majority vote in the comments section or a dedicated voting mechanism.
Dude A: Sugar Hill Gang's original of Rapper's Delight is infinitely superior to Def Jam's bro, anyone who knows their hip hop agrees.

Dude B: No way bro, show me the battlemash or it never happened.
by wizardchicken May 05, 2013