Before answering the question, let us explain what a Simile is:
According to Merriam-Webster Dictionary, a Simile is “figure of speech comparing two unlike things that is often introduced by like or as (as in cheeks like roses)”
It is similar to a metaphor but simpler and easier to understand and the metaphor is not presented by the comparatives “as” or “like”.
The phrase from “Barrio Boy” that contains a simile is:
"...a large hole that looked like a horse collar."
The exact simile is: a large hole like a horse collar.