Definition of K-hole in US English:

K-hole

noun

slang
  • A trance-like state induced by excessive consumption of ketamine as a recreational drug, typically characterized by temporary paralysis, disorientation, hallucinations, or a sense of disassociation, and likened to falling into a hole; (also in extended use) any kind of trance-like state.

Origin

1990s; earliest use found in Out Magazine.