Slapnut Day Share definition Flag It is a day where you get an excuse to slap ur nuts anywhere u want. And if if u slap ur nuts then rub it on someone, they have to slap ur nuts Guy 1 : Oh man, I'm bout to slap my nuts bro. Guy 2 : Why tho? Guy 1 : Cuz it's Slapnut Day Slapnut Day by Random_Fandom October 26, 2019 Get the Slapnut Day mug.