It's when someone goes down holding his ankle & his foot is pointing in the wrong direction. Happens about once every 2 1/2 years.
You'll be like, "Holy shit! His foot is all bent sideways!" and he'll be like, "Aghhhhh! My fuckin' ankle!!!", and I'll be like, "see, that's Mookfoot"
1. A term for a boyfriend with the disposition of Olaf the Snowman, who is also incredibly injury prone. 2. Something that Mario says on the third jump in Mario 64.
Elsa: "what happened to him!?"
Anna: "he had a sledding accident involving a tree, a reindeer, a small puddle, and four penguins."
Elsa: "oh he is such a..."
Together: "...Mooboo..."
OR
Mario:"whop, whoop, MOOBOO :D"