The act of kissing someone on the cheek with your puckered anus. The recipient of the Dragon Wink must be sitting at the time otherwise things could become difficult.
You remove your pants, spread your butt cheeks and move closer towards the person, close enough so that your anus is almost touching their cheekbone. Either side is fine. Then, provided you've shat recently, push out your anus a little so that it forms a pucker and the propelled anus bit touches the recipients cheek.