mutt

Etymology 1

Clipping of muttonhead.

noun

1. A mongrel dog (or sometimes cat); an animal of mixed breed or uncertain origin.
   Coordinate term: moggy
   Mr. Beerbelly, Beerbelly / Get these mutts away from me / You know, I don't find this stuff amusing anymore 1986, Paul Simon (lyrics and music), “You Can Call Me Al”, in Graceland
2. (usually derogatory or humorous) A person of mixed racial or ethnic ancestry.
   Soon, we will no longer be an outpost of Europe, but a nation of mutts, a nation with hundreds of fluid ethnicities from around the world, intermarrying and intermingling. Americans of European descent are already a minority among 5-year-olds. 2013-06-28, David Brooks, “A Nation of Mutts”, in The New York Times, →ISSN
3. (chiefly US, slang, derogatory) An idiot, a stupid person.
   Mother fuckin' mutt! You, you fucking piece of shit! 1990, Nicholas Pileggi, Martin Scorsese, Goodfellas, spoken by Tommy DeVito (Joe Pesci)
   “He’s so blatantly stupid. He’s a punk. He’s a dog. He’s a pig. A con. A bullshit artist. A mutt who doesn’t know what he’s talking about,” he said, among many other things, in a video. 2019-11-20, Luke O'Neil, quoting Robert De Niro, “Robert De Niro v Trump: a complete history of a (mainly one-sided) beef”, in The Guardian
4. (Internet slang, derogatory) A person from the United States, in reference to sense 2.
   See also: amerimutt

Etymology 2

noun

1. Alternative form of matha