What is Bhopping?
BHop is a term used to describe "bunny hopping" within Gmod. However, as the name was long, it was shortened down to the simple "Bhop"
Prespeeding
Hold the W Key (And Sprint, if able) followed by the Space Bar. Release the W Key, then press your +left bind and a, without removing your hold of the Space Bar. If you've done this correctly, you should be bounding in a circle gaining speed. This can also be done without binds in figure 8's.
Bhopping
After the prespeed, you'll want to be able to control said bhop, right? Well, just simply press the A and D keys to rotate, using the mouse in assistance to your turning, and, there you have it. :)