is "yessir" is the same like "yes, sir"? can you explain? thank you :)
"Yessir" is an INFORMAL way of expressing agreement or confirmation.
Mike: Did you hear what I said?
Me: Yessir!
It's an alteration of "Yes, sir."
Mike: Did you hear what I said?
Me: Yessir!
It's an alteration of "Yes, sir."