I use this term as follows:
Think about the 7th hole at Yeamans Hall Club (The Road Hole)...
Let's say the flagstick is back left, and you've hit a poor drive down the left side leaving you with a long approach that must carry the bunker in the front left, and stop very quickly (a low percentage shot). I would do my best to get the ball to the front edge of the right side of the green (the "front porch") and see if I can make 4 from there.
TS