Concertosis 

When someone purchases expensive concert tickets and on the day of are too sick to attend.

It's a shame Kaitlynn had Concertosis.

Concertosis by ms.wronggeneration October 2, 2010

Conceitisism 

The practice of being conceited. This is also the practice of finding oneself so ridiculously good looking that you fall in love with yourself and no one else. Symptoms may include, but are not limited to, cockiness, looking in the mirror excessively, talking about yourself constantly, bragging about your hair cut and man sweater, and last but not least, thinking highly of one's abilities.

"Have you ever wondered if there was more to life, other than being really, really, ridiculously good looking?"

-Derek Zoolander

**this would be considered conceitisism**

Conceitisism by matt williams (PV) March 15, 2011

Concertitis 

in withdrawal from live concerts

Can we go to a concert soon? I have bad concertitis!

Concertitis by queandsera January 16, 2014

concertmistress

A female violinist who is in charge of the entire orchestra, and who outwardsly displays her authority, and opinions to the usually more pompous conductor. She apparently kicked the butts off of the other violinists (including male violinists) to get her prominent position.

The concertmistress wore a gorgeous dress, that would have looked better on a more humble soloist.

concertmistress by You wish you knew0000 January 17, 2007