It became extremely popular, as did slam dancing and other forms of punk dancing, in the mainstream a few years after it started. This is true for most things punk and true metal did.
One of the clearest examples of this was performed by a crust punk band with a cult following for the late 90s and early 2000s called R.A.M.B.O. where they would encourage the crowd to dress up as either protestors or cops and stage a mock riot. The two sides would form up and then 'wall o death!' each other.
So, sorry children, Lamb of God did not originate this.
See the cops ahead,
March in unison,
WALL OF DEATH THE SYSTEM!!!
1)either into a big circle with nobody in the centre
2) or into two colums with an approximately 10 metre gap in the middle
then when the heavy part starts(usually promted by a count down) the cround run at each other.
The most popular wall of death songs are "black label" and Laid to rest" by lamb of god
I was really supprised when aiden did one before their the song "I set my friends on fire"
Musical tension hightens.
40 seconds in, Randy screams.
The wall of death begins.
Bodies surge together.
Bodies fall together.
"yeah, but it was totally worth it!"