tardal wave 

A wave or mob of retarded people. For the purpose of this definition, a retarded person is a person lacking worldly knowledge or common sense.

"Come on, Bill, Honors Lang is over... the tardal wave is coming."

tardal wave by Emily and the Anti-Rap Pig April 18, 2008

Turdal wave 

A dump so big that it creates a tidal wave.

I just dropped one so big it created a turdal wave.

Turdal wave by MrMash September 10, 2013