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Twelvoes are 11-13 year old kids that are overly competitive in video games, such as Minecraft or Call of Duty. Twelvoes are usually very vocal, and are the type of kids to go "I fucked your mom last night get headshotted".

Similar to a twelvie.
Person 1: Get headshotted you fucking noob! I fucked your mom last night and she was fine!
Person 2: Stop being such a twelvoe.
by bepis123 April 07, 2017
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