When a large group of people, usually trying to move in an orderly fashion, compress and expand repeatedly, in an accordion-like motion. Can commonly be seen taking place with groups during parades.
This parade is great, but I think all the groups have Butler Band Syndrome... I'm getting dizzy from watching it!
Dave Matthews Band Syndrome (D.M.B.S.) is a negative characteristic of something, which is otherwise enjoyable, but you are forced to HATE because said something's fans lack the ability to shut the fuck up about how much they love it.
Psychological despair after passing up an opportunity that would have yielded positive effects because it seemed unsafe. The term is named for Pete Best, the original drummer for the Beatles who dropped out of the band because he believed the band wasn't going to make it. The term also creatively uses the name of the Beatles' hit song, "Sgt. Pepper's Lonely Hearts Club Band". The term gets it's origins from a play named "Sgt. Peter Best's Lonely Hearts Club Band Syndrome".
When she started seeing someone else, he had a bad case of Sgt. Peter Best's Lonely Hearts Club Band Syndrome because he didn't ask her out first.