fudinthia Share definition Flag phenome for 'f'd in the a' or, in expanded form: 'fucked in the ass'. Fudinthia rhymes with Cynthia, thus making it a word for poets. Dude, you just got fudinthia hard! I bet your poop just walks out the back door now! fudinthia by Yagotta B. Kiddin February 14, 2013 Get the fudinthia mug.