Definition of goo noun from the Oxford Advanced Learner's Dictionary

 

goo

 noun
noun
BrE BrE//ɡuː//
 
; NAmE NAmE//ɡuː//
 
[uncountable](informal)
 
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any unpleasant sticky wet substance see also gooey Word Origin early 20th cent. (originally US): perhaps from burgoo, a nautical slang term for porridge, based on Persian bulġūr ‘bruised grain’.
See the Oxford Advanced American Dictionary entry: goo