(slang, derogatory) A stupid person.

"Stupid person," by 1951, American English, from dumb. The Disney musical cartoon is from 1941; in it the elephant's name is a mocking nickname based on Jumbo.

plural of dumbo

A neigborhood in Brooklyn, New York City, New York state, United States; Acronym of Down Under the Manhattan Bridge Overpass.

Alternative form of DUMBO: A neigborhood in Brooklyn, New York City, New York state, United States / A town in Bié, Angola

Any of several species of umbrella octopuses of the genus Grimpoteuthis.

plural of dumbo octopus