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.
A stupid person; a meathead.
A ball of minced or ground meat, seasoned and cooked.
An optical landing system.
An easy pitch to hit, especially thrown right down the middle of the plate.
A menu icon of three horizontal dots.