Thuddy Share definition Flag 1. To do something crazy, or exceptionally well. Taken to another level.2. Slang for thirty. 1. Yo Steph Curry went THUDDY last night. He might win MVP.2. I’ll be home in thuddy. Thuddy by Yhelfner22 October 18, 2019 0 0 Get merch Get the Thuddy mug. Buy Now — $32.95 See more merch