Answer: goop

AnswerCrossword Clue
GOOPMud
GOOPSymbol of bad table manners.
GOOPBoorish creature.
GOOPBoorish fellow.
GOOPGelett Burgess' nonsense creature.
GOOPBurgess' finger-licking being.
GOOPNonsense creature, from 1900 book.
GOOPGelett Burgess creature.
GOOPSticky substance: Colloq.
GOOPGelett Burgess's invention.
GOOPNonsense creature.
GOOPNonsense character.
GOOPChild lacking manners
GOOPChild with poor manners
GOOPRude person
GOOPSticky blob
GOOPBurgess creation.
GOOPSlime
GOOPTar, e.g.
GOOPSticky, viscous stuff
GOOPGreasy kid stuff
GOOPMessy gel
GOOPSticky, wet stuff
GOOPSticky semiliquid
GOOPGooey stuff
GOOPIcky or sticky stuff
GOOPMuddy stuff
GOOPYucky gunk
goopviscous or sticky substance; goo
goopgoo or gunk
goopbad-mannered or inconsiderate person; clod; boor
GOOPIcky sticky stuff
GOOPStuff to smear
GOOPSlimy stuff
GOOPViscous gunk
GOOPViscous stuff
GOOPSticky substance
GOOPGunk
GOOPHand-cleaning brand
GOOPYucky stuff