12ves Share definition Flag A 12 is a guy/KID that signs up for a site 13+ or is grammatically incorrect in all ways...no offense to actually 12 year olds. Just a analogy A 12: "I am 12 and wut is dis?"You: Hmm.....12ves 12ves by 12mastazz April 25, 2011 0 0 Get merch Get the 12ves mug. Buy Now — $32.95 See more merch