Knee-nuts Share definition Flag Adjective: So hot that your nuts hang down to your knees. Emily: Is it bad out? I checked the weather and they said it's 103 degrees.Jeff: Yeah, it's knee-nuts hot out there. Knee-nuts by M.Blur July 22, 2012 0 0 Get merch Get the Knee-nuts mug. Buy Now — $32.95 See more merch