When a man cuts a hole into the bottom of a box of popcorn, and secretly slides his penis into it. Nonchalantly, he will offer his date/hooker for a handful of popcorn. If he gets lucky, she will reach down far enough and grasp the head of his penis. At this point, she should offer to give Popcorn Head.

When you eat dirt for the first time and leave your family to build a shack in the woods

A.K.A: Movie Head. A male will secretly(or not) cut a small hole(or not) into the bottom of a popcorn tub. The next time his date reaches for popcorn, she'll be in for a surprise. If a woman knows her place, she'll proceed to eat the 'popcorn' straight from the tub with her mouth.