What literary device is this, "I owe you a lot of $!"?

Laziness? Too lazy to write out the word "money" or "dollars"?

Yes that's true but not an option..

The literary device used in the phrase "I owe you a lot of $!" is a form of figurative language known as a metaphor. A metaphor is a figure of speech that makes a comparison between two things that are unrelated, but which share some common characteristics or qualities. In this case, the phrase is comparing the act of owing someone money to a situation where one person owes a debt to another. By using metaphorical language, the speaker vividly expresses the idea of being indebted in a relatable and memorable way.