Slang. It’s another way of saying are you serious but only for former or current McDonald’s workers.
by B-rizzle February 27, 2019
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r u mcserious
• R.U.A.H.
• r u gey
• r u 4 sexes chat
• r u high
• R u mad?
• r-u-n-n-o-f-t
• r u trippin
• R U up?
• r&u