face-dusting
Face-dusting is when you say something dumb on your friend’s Facebook or Twitter, and then you vanish like you were never there. You’re like the bad guy in a cartoon who runs away after the punchline.
Your friend posted a picture of their new hairstyle. You comment, 'That looks like a squirrel got a haircut.'
Your friend posted a tweet about their new phone. You reply, 'That phone looks like it was dropped from a plane.'
Your friend posted a status about their new job. You say, 'That job sounds like a prison for people who hate math.'