1+1 Share definition Flag Upvote this if you think it's 2 Person 1: What's 1+1? Person 2: Window Person 1: No! you didn't fall into my upvote trap. Person 1: ???? 1+1 by TTV.MrSAVAGEllamaHUMAN October 7, 2019 Get the 1+1 mug.