(Verb) When you cum so big it blows the head of your pecker off.

when you're hungover as shit after a spending a night drunk as a skunk

When you cum so hard it sprays through your pants.

A man jizzing in a young guys face and mouth, with the man:
-having a much larger dick than the young guy
-being much older than the young guy
-being much taller than the young guy
This is done with the man being completely naked and the young guy being fully clothed. It can be practised while the man stands and the young guy kneels down or the young guy laying on his back with the man riding on his chest. Also this act should be practised in silence - but moaning is permitted. In some cases the powercum ist initiated by the man peeing in the young guys face and mouth.