12345678910 Share definition Flag When you're 30 years old and you're still stuck in kindergarten because you're still shit at counting Stupid Grown man: 12435698107 Mom: Let's try again, but like this "12345678910" 12345678910 by Something In This World November 6, 2020 0 0 Get merch Get the 12345678910 mug. Buy Now — $32.95 See more merch