Tomfoolery, idiocy, and/or periods of idiocy.

The act of continuously being dumb

the act of being continuously dumb

An unknown foreign language perpetuated by people with no understanding of history or facts whom attempt to brain wash others for the purposes of mass propaganda.

Example: "What did Donald Trump just say?" "I don't know, I don't speak Dumbassery."

Example: "Did Kelly Ann Conway just say alternative facts?" "Yes, I think this is the equivalent to huge 'lie' in English in the foreign language Dumbassery"

Example: "Did Donald Trump just say he's going to send the Feds to Chicago?!" "Yes, he's speaking Dumbassery, the equivalent action for this statement is Dutarte murdering thousands of people for drug abuse with absolutely no proof"

Behavior that is repetitively stupid and often damaging to people and property.

A broad characterization of inexplicably stupid behavior, generally that which involves a lack of common sense. Often used as a sentence all on its own.

When you're playing Catan and you put the robber on a tile that you're on.