Which of the following is an example of a colloquial term?

The term "butt" is indeed a colloquial term used widely in everyday language to refer to the posterior or buttocks region. Colloquial terms are informal and often used in casual conversation, making them more relatable and accessible to the general public. "Butt" is commonly understood and does not carry the formal tone of anatomical terminology.

In contrast, the other terms presented, such as "posterior," "gluteus maximus," and "hips," are more anatomical and technical in nature, which are typically used in medical or fitness contexts. They require a certain level of understanding of anatomy and are not used as liberally in casual speech as "butt." This distinction in formality and context helps clarify why "butt" is the correct example of a colloquial term.