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..."
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