Diarrhea propelled by excessive gas.
Last time I had KFC and a Coke, I had an asplosion in the food court bathroom.
1. Noun - An explosion or implosion. Contains heavily ninja connotations.
Verb - Aplode
Adjective - Asplodey/Asploded
"Your head aplode!" (aplode is the verb, asplosion being the noun) (common phrase - implies asplodee viewed something far too awesome for their tiny cranium)