A perjorative term for someone so ugly, so exceedingly unattractive. that he or she is as "ugly as a butt" (a misnomer, since many buttocks are beautiful indeed). A popular teen-age slang term since the 80s, "butt-ugly" most probably began as military slang c. World War II. Probably because enlisted men found nothing attractive about another enlisted man's hairy, sweaty, very possibly pimpled butt!

A euphemism for “kill me” now that composting oneself after one’s death has become popular.

very ugly
(from butt=very)

A condition of being extremely ugly.

As ugly as buttocks. Mostly like large, hairy and deformed buttocks.

(Not Jennifer Lopez's buttocks)

Exceedingly ugly. Originated by GIs in WWII, this term is as fresh as ever.

A person or object deemed so ugly (unattractive physically) they had to add butt in front of it.