9/11

noun2

1. •
   An event comparable to the September 11 attacks.

   • Eleven million Spaniards responded to "their 9/11" by demonstrating in the rain against terrorism and their government's policies. — 2005
2. •
   (Internet, humorous) A negative event that a person or a group of people have experienced whose impact is, hyperbolically, comparable to that of the September 11 attacks.

   • This was my 9/11.