Top Definition
The term used to describe when a mans penis curves upward, the curvature tending to be more dramatic toward the head or 'helmet."
While spending quality time with my boyfriend, he became aroused while we made out on his bed. I yanked off his pants, surprised to see that his dick had a happy-helmet. It was practically smiling up at me.
by BombadierBillyGoat April 03, 2011

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