From Longman Dictionary of Contemporary Englishgoopgoop /ɡuːp/ noun [uncountable] American English informalSTICK a thick slightly sticky substance
Examples from the Corpus
goop• What's that goop you're putting on your hair?• The Olympians are swabbing their faces with Desitin, the white goop generally used to combat diaper rash.Origin goop (1900-2000) Probably from goo 