The term directly correlates to the head of Nazipropaganda, Joseph Goebbels. Grobble-bobble can describe a person who is spreading false information. Grobble-Bobblery can also be used to describe the act of being a Grobble-Bobble.
She is a grobble-bobble when she told her kids that vaccines are bad.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.