40/30 Share definition Flag Someone who is in their 40s but looks like they're in their 30s. I met this super hot 40/30 last night. She's 44, but she looks like she's 32. 40/30 by pearbear September 10, 2011 0 0 Get merch Get the 40/30 mug. Buy Now — $32.95 See more merch