An action performed by Woodknockers to ensure a steady flow of good luck.
Scruffy: "Dude, my mom has no idea where I am right now, she's none the wiser."

Ferguesson: "Oh man, you'd better air knock on that, there's a tree all the way over there."
by Internet QA Group December 19, 2012
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aka KAK - Knocking Air Knuckle, used in conjunction with SKEECOO SKEECOO. A simple, but effective visual using one hand in the air in a motion that looks like knocking on a door. For an incredible effect, try a double knocking air knuckle. Wow, that would be something!
"I told Franny I would go over her house after work, but I'm not really diggin on her any more. I never go back on my word though, so I went over alright and gave her door the ol' knocking air knuckle and then busted outta there!"
by NookieJar October 16, 2009
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