Define Hyperdeath Meaning

When you die but come back to life. This is in undertale, a game. Asriel is the god of hyperdeath.

In Undertale: A term describing a form of death where your SOUL merges back together after being destroyed, thus making it impossible to die whilst fighting Asriel, God of Hyperdeath.
Otherwise: A form of death that strengthens your soul.

A form of death in which one is killed so hard that they loop back around to being alive again.