PSVM Share definition Flag Acronym for Poop, Spit, Vomit, Melt. In other words: the ultimate reaction to something exciting. A fan-gasm. Person 1: Did you hear about the concert?Person 2: Holy, POOPSPITVOMITMELT (PSVM)! I'm so excited!! PSVM by Weskdaverb April 10, 2011 0 0 Get merch Get the PSVM mug. Buy Now — $32.95 See more merch