What is a mushing glide? Source: Wolfgang Langewiesche - Stick and Rudder; An Explanation of the Art of Flying




Why is it called a mushing glide?
In this glide, does the aircraft point its nose less (or more?) steeply? 
How does it steepen the descent?


I find the explanation confusing. At one point it seems that a mushing glide is caused by a high AOA and at another point it seems that a low AOA (pointing slightly above horizon) causes it.
Why is it called a mushing glide?


The aircraft is not cleanly cutting through the air. It is "mushing" through the air at a high angle of attack creating lots of drag and a slow forward airspeed.


  In this glide, does the aircraft points its nose less (or more?) steeply?


The aircraft has its nose pointed up (less steeply) than a normal glide.


  How does it steepen the descent?


The low forward airspeed and high drag creates a high rate of sink relative to the forward motion. Low forward speed and relatively high sink rate means the descent will be very steep. A fully stalled condition would be an extreme example of a "mushing" glide.  


  low AOA (pointing slightly above horizon) causes it.


pointing the nose slightly above the horizon is still a High Angle of Attack, not low AOA.