frightwave 

A collective shock or fear spreading through a crowd.

The gunshot set off a frightwave in the densely-packed concert crowd resulting in a stampede towards the exit gate.

frightwave by prik kee noo May 13, 2011

Frightmare 

(noun): Originated by "1000 Ways To Die". A frightmare is when you have a repeated nightmare and you die in your sleep from a heart attack.

Tina told me that she use to have nightmares about midgets. That's before she died in her sleep from a frightmare.

Frightmare by capnkev April 8, 2009

Frightmare 

A frightening nightmare.

Person A: Did you sleep well last night?
Person B: No, I had a frightmare and woke up drenched in sweat.

Frightmare by Rei_Uchiha May 12, 2010