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1.
When a human head is compressed in a manner which causes it to pop.
A man crosses a street and trips in front of a car making a right turn. His head lies perfectly in line with the cars front tire and is slowly ran over, causing a quick pop as the tire reaches the peak of the head.

Onlooker: "ah man!! Did you see his head pop?!"
Onlooker 2: "ahh jeah, that head popped hard!"
by Tommy Horse February 01, 2011