Using this glitch, you can get to a spot where nobody would expect you to be. You probably won't win any games camping up there, but it can be fun to surprise the other team.
On the terrorist side, there is a ramp coming up from the water. Jump onto the ramp's ledge, and run up towards the wall in front of you. Right before you run into
the wall, jump. Just do a normal jump, not a crouch jump. It will probably take you a few tries, but eventually you will find yourself on what seems to be an invisible ledge.
Once you are on the invisible ledge, just walk across the wall. You can stop in the middle, or you can go all the way to the other side. You can even walk on that grassy stuff, but you will fall
off if you go too far.