When a loser or nerd waves at you, thinking he's your friend and you look away quickly pretending you did not see him. This is a very awkward moment for the nerd.
I can't believe it, I was wogging through Central Park today, and that dork Reginald from shop class saw me. Before we made eye contact, I glanced away, turning his attempt at greeting me with a hand gesture into a dorkwave. Hah, hah, I wogged in the opposite direction before he could try again!