Definition of "goopy"

A hard November wind is spattering goopy sleet against the broad windows all around the hall.

1996, David Foster Wallace, Infinite Jest […], Boston, Mass., New York, N.Y.: Little, Brown and Company, page 361

[…] and how they all seem like limp smug moronic self-satisfied shit-eating pricks with their lobotomized smiles and goopy sentiment and how he wishes them all violent technicolor harm in the worst way, […]

1996, David Foster Wallace, Infinite Jest […], Boston, Mass., New York, N.Y.: Little, Brown and Company, page 353

“She’d had some goopy notion of self-sacrifice, or maybe it was self-punishment, of making amends.”

2007 June 17, Jennifer Egan, “Woman Warriors”, in New York Times‎