Putting your arms by your sides, then raising your fore arms and waving them up and down with your hands outstretched (like so your thumbs are pointing to your eyes and your hands are flat like if you were going to slap someone) saying "napkin" many times. It's used when your hands are too messy to get one yourself, or you're just lazy.
"Napkin! Napkin! I really need a napkin! *does napkin arms*"
by Napkin Armada March 04, 2009