nuder Share definition Flag some one who is very prudish, doesnt like to talk about sex, or have it, they think everyone should be nuetered I went on a date with Sara, she didnt want to do anything, not even kiss, she is such a nuder! nuder by lily3x2 April 1, 2007 0 0 Get merch Get the nuder mug. Buy Now — $32.95 See more merch