Literally: In reference to an impact of any kind, used jokingly to express disbelief in magnitude of force.
Figuratively: References a mess or inextricably confused situation.
My girlfriend heard something from someone else who was spreading rumors about me, and now she doesn't believe me when I try to deny the rumors. Plus, my mom tried to have me arrested for wearing my older brother's shirt, so that doesn't help my credibility. Explode-o-tron.