PSVM
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!!
Person 2: Holy, POOPSPITVOMITMELT (PSVM)! I'm so excited!!