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When the mosh pit splits in half and runs at each other at a certain point in the music. A good song to use is Duality by Slipknot.

Usually followed by much moshing

Joining a wall of death is very scary, but one tip, is to take a deep breath before running, and look at the wall of people in front of you and decide on who you're going to run at.

It's a huge adrenaline rush.
Harry: Dude, wanna go join the wall of death?
Sally: Nah, I got a bruised eye moshing with those huge guys earlier. I'm out for the rest of the night.
by Candyfloss_funk August 29, 2005
Should be avoided at all costs. The area between genitals and ass hole - usually only explored up close when performing oral sex.
'I went down on Sheila the other day and her wall of death smelt like frog spawn'
by PikeyClare March 27, 2007