When someone is so Intoxicated and tired that they start uncontrollably bobbing their head. Giving the appearance of giving oral sex to a ghost.
Bro! Pat was so wasted last night he started blowing ghosts at the bar. He's going to wake up with ghost jiz all over his face.
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The metaphorical dick sucking of a friend/colleague with a high regard of praise to others while the aforementioned friend/colleague is not around.
Cody was ghost-blowing you yesterday for your skill with the ladies.