The wall that your bed is pushed up against.
The booger wall is not the entire wall, but just the section of wall that begins even with
your head and runs along the edge of your matress to about mid-thigh, or as far as you can reach toward the foot end of your bed. This length of wall extends
from the top edge of your mattress down the wall approx 4 inches. Boogers are picked while lying in bed and wiped in this area.