She's built like a nickle-machine

The story:

I was singing the song with my co-workers, Dave and Steve, and I guess I sang "nickle-machine" a bit too loud because I heard them both say, "huh?". Since I was younger I thought that's what the song said, and so I never paid much attention to the words after. Now it is a office joke...whenever something is misunderstood or ambiguous it is "nickle-machine". An example sentence would be, "I don't remember what my boss said...something about nickle-machine."