'guck' definitions:

Definition of 'guck'

From: WordNet
noun
Any thick, viscous matter [syn: sludge, slime, goo, goop, gook, guck, gunk, muck, ooze]

Definition of 'guck'

From: GCIDE
  • guck \guck\ n.
  • 1. any thick messy substance.
  • Syn: goo, gook, gunk, muck, ooze, sludge, slime. [WordNet 1.5]