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1.
When multiple people in a line rub their gentials against the person in front of them's rear, while placing their hands near or on said person's hips.

Another term for grind train.
"Did you see the human grindipede at homecoming? There must have been at least twenty-five people in that thing!"

"Oh, dude, I got such a raging stiffy in that human grindipede with Jessica, you don't even know..."
von sexytacoman 22. September 2011
 
2.
Noun:
The act of multiple people grinding in a conga-line formation. Also called the grindipillar or the grind line.
"Billy was scarred for life after his first school dance because he had witnessed a human grindipede"

"Did you see how long that human grindipede was yesterday?"
von Wizard Lizard 1. Oktober 2014