A mental disorder that makes someone think Mick Jagger, lead singer of the Rolling Stones is attractive. Symptoms include kicking everyone to the curb unless they look like Mick Jagger. The most famous case is American pop star Ke$ha, who has been suffering from Mick Jagger Syndrome since birth.
Ke$ha- "And now, the dudes are lining up cause they hear we got swagger, but we kick em to the curb unless they look like Mick Jagger."
Bob- "What? Mick Jagger isn't even attractive!"
Jane- "Hey shut up she has Mick Jagger Syndrome. You shouldn't make fun of people with disabilities!"