I word particularly negativly used referring to the fictional character of Apollo in Lore Olympus . The use of the word is because in the story of lore olmypus Apollo is depicted as a rapist toward the main character persephone, going back derived by the greek mythos.
When diarrhea is violent, it's explosive; An Asspocalypse occurs when Satan himself comes up from the depths of hell, through your colon, and out of your anal orifice in what only can be describe bout of hellish antichrist diarrhea. Explosive is an understatement, and complete loss of consciousness is not uncommon. All it takes is to bring on the asspocalpyse can be as little as one bad burrito from taco bell.
"Did you hear Johnny last night? fuck he had the taco shits!"
"Taco shits? More like asspocalypse."
"I'm not cleaning that shit up"
Used to describe any form of music that is being played so obnoxiously loud that one feels as though their ass is being pounded by every note.
"The asspounding beat coming from the car down street was loud enough to violate every orifice of my body in the most inappropriate ways."
"I could hear the faint asspounding beat coming from the teens headphones on the subway as I sat silently across from them wondering why anyone would listen to Justin Timberlake in the first place."