Are you McSerious??????
by mark1234569802145 April 26, 2006
Get the McSeriousmug. 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
Get the r u mcseriousmug. Get the McSeriousmug. Get the r u mcseriousmug.