penisplosion 

An intense abundance of fluid exiting the penis.

"Penisplosion" was the last word that Lynda remembers hearing before being shot against the wall by a neverending force of flowing semen.

penisplosion by Borisimo September 28, 2003

pantsplosion 

A pantsplosion occurs when you shit yourself with such violent ferocity that feces erupts from the beltline of your pants. This is usually the result of being incontinent when wearing tighty-whities (the shit just has nowhere else to go).

Person1: Dude, what the hell? Your back is covered with shit!
Person2: Yeah, I ate too many rancid gas station hot dogs and couldn't make it to the can before pantsplosion.
Person2: Dude, it's up to your shoulder blades?
Person1: Word!

pantsplosion by RestInPeaceMoffTarkin March 10, 2011