A sticky, slimy, or messy substance; anything unpleasantly thick or gooey.
Origin uncertain, possibly imitative or from dialectal English, first recorded in the 1960s. The word may be a blend of 'goo' and 'muck,' or derive from an onomatopoetic representation of wet, sticky sounds.
Guck is a genuinely recent word—it barely existed before the 1960s, and its popularity exploded with NASA engineers using it to describe leftover rocket fuel residue and other messy spacecraft problems.
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