I was called that once. Looked it up in the dictionary. It's best you don't know what it means.

— George Washington McLintock (John Wayne)

8 seconds sound clip from the McLintock! (1963) movie soundboard.

You can hear this line at 00:33:40 in the Blu-ray version of the movie.

Quote context

[...]

- But she said she want to have a talk with you.

- I heard.

- Good evening, Lem.

- Good evening, Mr. Mac.

- Say, Mr. Mac, what does unprepossessing mean?

- I was called that once. Looked it up in the dictionary. It's best you don't know what it means.

- Uh-huh. Thank you. Giddyap.

- Hey, what am I going to tell her when she asks where you went?

- When in doubt, tell the truth.

- She wouldn't expect that from you anyway.

[...]