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"A piece of ass" is a vulgar American slang term used to refer to a person, typically a woman, viewed as a sexual object, or to an act of sexual intercourse. 

 

Meaning and Usage

• A sexually attractive person: The term is most commonly used in a demeaning and objectifying manner to describe a person, usually a woman, whom the speaker finds sexually attractive. It is considered highly offensive and disrespectful.
• Sexual intercourse: In some contexts, it can also refer to a casual sexual encounter or the act of sex itself, particularly a one-night stand.
• A male prostitute: In rare LGBTQ+ contexts, it can refer to a male prostitute. 

 

Tone and Connotation

This is a crude, colloquial, and highly offensive idiom. It should not be used in polite conversation or formal settings, as it demonstrates a dismissive attitude toward the subject and is widely considered disrespectful.