An explosive bowel movement, usually involving an infant or toddler wearing a diaper which was either put on incorrectly or simply could not contain the explosive force of the movement.
My family and I were traveling over the summer and the smell of the car soured quickly. After we stopped and viewed the damage - shitastrophy was the first thing that came to my mind.
Example 1: "I came home and my dog had shit all over his kennel. His fur was covered with shit and the whole house smelled like shit. It was a total shitastrophe."
Example 2: "My dog shit on my floor and the roomba dragged it all over my house. It was a shitastrophe."
something very undesirable that occurs during sexual intercourse. almost always shortly followed by the sudden, yet mutually agreed upon permanent separation of the copulating couple.
helen: "what happend with you and Bill? i thought you were still riding him like a wild dragon-steed..."
Betty: "what happened???!!! what HAPPENED???!! well let me tell you about Bill and the 'rusty trampoline' move he tried last night...boy was that a sextastrophy"