Noclip, also known as fly and ghost, is a cheat that disables the effect of gravity and makes all objects nonsolid to the player. This allows you to glide freely through the world. If you exit the world or simply fly into a wall you will be unable to shoot.
sv_noclipspeed- The maximum speed the player can move during noclip. Default is 5.
sv_noclipaccelerate- The speed at which the player accelerates during noclip. Default is 5.