dire reasons Share definition Flag Soundalike and polite slang for diarrhea. Appropriate because of the 'direness' of expelling said feces out of one's body. After eating that undercooked chicken, I had dire reasons last night...it wasn't pretty at all! dire reasons by chrism July 4, 2004 0 0 Get merch Get the dire reasons mug. Buy Now — $32.95 See more merch