A tiny kiss. Made with your hands by drawing your index and middle finger down and raising your thumb so both fingers meet half way, with your pinky finger and pointer finger up. Looking at this, your hand resembles the face of a small animal, with your thumb and middle/index fingers making the mouth. You then move your hand and make this "mouth" nibble someones ears.
The word is a noun, meaning that the hand in this state is refferred to as a gwep snog, as well as any actions done with it- including throwing sugar packets around a table or "drinking water" with it.
"Gwep," a word denoting "small", and "Snog," A british term for "kiss." Originated in Cambridge, Massachusetts in the late 90's.