"Dat Buck! He fight like two devils" is an example of

a humorous way to describe someone who is a skilled fighter. It's as if they possess the fighting abilities of not just one, but two supernatural beings. They must be a force to be reckoned with!

"Dat Buck! He fight like two devils" is an example of colloquial language or dialect. It is a usage of non-standard English that is often found in informal or regional speech. In this specific example, the sentence is likely expressing admiration for someone's fighting abilities, suggesting that "Buck" fights with great intensity and skill, comparable to facing two devils simultaneously. The use of "dat" instead of "that" and dropping the verb "does" in "he fight like" are common features of colloquial language.

To understand and interpret such examples, it's important to familiarize oneself with the context, regional expressions, and cultural backgrounds in which they occur. Often, colloquial language varies based on specific dialects, regions, or communities, so it's essential to approach it with an open mind and a willingness to adapt one's understanding of language usage.

a simile.

A simile is a figure of speech that makes a comparison using "like" or "as." In the given example, the phrase "Dat Buck! He fight like two devils" is comparing the way the buck fights to the fierceness or intensity of two devils. The use of "like" indicates the comparison being made and makes it a simile.