I get called boss by two guys: the guy who works at the gas station (a middle-eastern immigrant) and a guy who I carpool with, from Egypt.
My husband & I use this as an opportunity to snark each other. <smirk> "He called you “sir!” <smirk>
“Ha ha, he called you ma’am! Ha!”
Yes, we are children.
NCIS is a really popular show. I now call my boss “boss.” Fortunately, she does not Gibbs-slap me.
I also have a patron I call “chief.” He is the Chief of Police.
Sounds like you’re really really old children…
I was dropping off a car at the service department of a dealership this morning, and I heard one of the service advisers calling his customer “boss”! I thought of this thread, of course (the guy using the term was mid-20s, no more hispanic than average around here, and had a wanna-be car salesman vibe to him).
Great username! That’s almost every love song recorded! 
Without the el; as a form of address it’s very common in Spanish and doesn’t carry any articles (no “el jefe” but also no “mi jefe”).