When a toothless whore with only three limbs, usually called Sloppy Sue, donates her body for up coming tattoo artist to practise on her body as a canvas. In return she is given a weekly allowance of $2 American Dollars.
"Damn man I haven't had a customer in a while" "You got 2 dollars?" "Yeah!" "You should get yourself a Minneapolis Sketch-Book!"
During a night of drinking, the first friend to pass out then becomes a 'sketchbook' for all those in possession of a sharpie. This friend is subsequently photographed and posted to Facebook, thus becoming a Sketchbook Friend.