Yours, Etc.: Origins and Uses of 8 Sign-Offs
1759, American English, from Mexican Spanish coyote, from Nahuatl coyotl.
A person who smuggles illegal immigrants across the Mexican-US border: the ''coyotes,'' the smugglers who bribe or otherwise contrive to get their charges past border authorities (1920s+) coyote uglyadjective phrase
Extremely ugly or nasty; piss-ugly, ugly as catshit: I had a coyote ugly date (1980s+ Students)