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Hudnut (hud' nuht) - n. The leftover bolt or screw in any "some assembly required" project.

Officially a Sniglet "Kids in the hall" fame.
What is that hudnut doing on the floor, I thought we were finished building this.
by DeepSix December 26, 2010
To get a bloody nose from getting a basketball dunked on your head when you had no business being in the lane.
I thought I was going to get the rebound, but instead I got hudnutted when the other player jumped over my head, dunked the ball, and elbowed me in the face. I should have known not to go for that rebound.
by Basketball Guru November 22, 2011