guck n 1: any thick, viscous matter [syn: {sludge}, {slime}, {goo}, {goop}, {gook}, {guck}, {gunk}, {muck}, {ooze}]
guck \guck\ n. 1. any thick messy substance. Syn: goo, gook, gunk, muck, ooze, sludge, slime. [WordNet 1.5]