You know what it looks like… but what is it called?
TAKE THE QUIZ“horse's”
The following 2 entries include the term horse's.
horse's ass
noun: a stupid or incompetent person : blockhead
horse's neck
noun: a tall drink consisting of ginger ale or ginger ale and a liquor served iced in a large tumbler with a spiral of lemon peel hanging over the rim
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Merriam-Webster unabridged