Backsides are commonly referred to as the butt, buttocks, derriere, rear end, posterior or hindquarters. These synonyms have been used for years to refer to this part of the human body, both in a humorous and formal manner. Other synonyms include the slang terms rear, booty, and buns. Some less common alternatives include keister, tush, fanny, and patootie. These terms are often used in literature, entertainment, and everyday conversation. Regardless of the word used, backsides play an important role in human anatomy and are often viewed as a source of attraction or humor.