Occurs when you have Messi's long "messy" hairstyle, and the feeling of getting owned by Germany 4-0 in the World Cup.
"Dude I'm not getting a haircut, just get the hell out Dave!"
Dave: "Wow, someone is having a Messi hair day."
Dave: "Wow, someone is having a Messi hair day."
by scottybballer July 3, 2010