Sorry MT, you made me do it. Everyone blame MT.
A partial birth abortion is when the baby is out of the mother. The baby is still attached via the umbilical chord. Hence, it is still part of the mother and her "Decision" to do what she wants. So what they do is they take a special "Scissors" apparatus and shove it into the baby's brain stem and open up the apparatus. This makes the brain stem go to mush and kills the baby in a few seconds. However, recent research shows that this is extremely painful for the baby. But no one has ever survived a partial birth abortion, so we can't really go out and ask them.
And btw, this is one of those "I'm right, you're wrong, so STFU please things..."