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1.
Something or someone that is excessively popular.

Popularity that excedes a logical amount or to the point where it or they become too prominent for many people's taste.

It is also used to refer to things that are over used or fashionable words or phrases that are 'beaten to death' by the press and media.

It can also mean something that it too popular to be sustained or it has exceeded it's limit of participants.
"X is overpopular. I can imagine why so many people like it"

"This place is overpopular, let's go elsewhere."

The college course was overpopular and many people had to be refused.
by Jay J. August 22, 2006