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Extremely ugly, especially of a sexual partner. A: "I'm sure that coyote ugly chick would go out with a loser like you." B: "Ha ha, very funny."
coyote-ugly(ˈkɑɪot ˈəgli and ˈkɑɪoti ˈəgli)
mod. extremely ugly. (see also double-bagger, triple-bagger. Supposedly, if one woke up and found one’s arm around a coyote-ugly person, one would chew off one’s arm—in the manner of a coyote escaping from a steel-jaw trap—rather than pull it back away from this person.) Is that your pet monkey, or is your date just coyote-ugly?