Verb: To blow out the contents of your colon through your asshole in a spectacular fashion. When done correctly, the fecal matter will cover anything within a twenty foot radius with a thin shit film.
Stan: Hey Carl, I just did a fecal explosion in your parents' bedroom.
Carl: Is there shit everywhere?
Stan: Of course there is.
Carl: Why did you do that?
Stan: You know that cocaine gives me the shits
Carl: Oh, you have coke?