The sexual phenomenon that occurs when someone giving you a blow job begins to sob, often uncontrollably.
Rather than stop, the giver becomes more enthusiastic, sobbing and blowing simultaneously. You are confused, and feel you should say something, but don't. Surprisingly, it becomes a huge turn on.
This act is also known in different regions of the world as The Pacifier, Sob Knob, Cock Therapy, or Moutharsis.
My girl gave me a Cry Baby while listening to Simon and Garfunkel. That's when I knew this could last.