Etymology
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goo (n.)

1903, American English, of obscure origin, probably a back-formation from gooey.

updated on October 02, 2012

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Definitions of goo from WordNet

goo (n.)
any thick, viscous matter;
Synonyms: sludge / slime / goop / gook / guck / gunk / muck / ooze
From wordnet.princeton.edu, not affiliated with etymonline.