Demtired Share definition Flag Demtired is a misspelling of Determined. It means determined, but tired also, and wanting to do something, (or too much) but being really tired. When I got up in the morning, I was so demtired because of the busy day ahead of me. Demtired by Mayflowr January 29, 2023 0 0 Get merch Get the Demtired mug. Buy Now — $32.95 See more merch