Boot Knife
The "Boot Knife" is a term which here refers to a boot with a knife sticking out of it. It is currently believed that the term originated during an extralives gaming marathon for charity, when it was pointed out that the symbol on the doors of the Pirate's Fortress in Majora's Mask looked like a boot and a knife. The meme has since grown to a viral level, rapidly becoming one of the internet's most popular memes.
"Look out man, he's got a boot knife."
Knife-booting
The act of using boots with sharp knives or blades on the bottom to move across ice.
"Michelle Qwan is famous for knife-booting," Amy said to Tedd.