English

Noun

horse's ass ‎(plural horses' asses)

1. (vulgar, idiomatic) A jerk; an unpleasant, unlikable person; an ****.

   At the party he behaved like a real horse's ass.

2. (vulgar, idiomatic) A thing or person which is visually unappealing.

   That is one horse's ass of a paint job.

References

• "horse's ass" in the Dictionary.com Unabridged, v1.0.1, Lexico Publishing Group, 2006.