A new pet that is very popular for kids this year. They are geese that are invisible to everyone but their master. Flabbergooses (the plural isn't called flabbergeese) are extremely intelligent creatures.

Adj. Something that is expected to have a long lifespan by virtue of having existed for a long time, based on the lindy effect, named for the New York restaurant Lindy's, coined by Albert Goldman and popularized by Nassim Taleb.