RF Ground (Reflections?)
I think more context is needed here. 
If you are trying to kill an RF signal, the best way to do it is with a 50 Ohm resistor (provided your transmission line is 50 Ohms). Connecting an RF line to ground would do exactly what you described (it would reflect everything). 

The term "RF ground" found in datasheets is usually used to distinguish between a DC ground. A pad connected to a ground plane with a very thin (high inductance) and long line is a decent ground as long as the DC resistance is low enough. For RF, this ground would be terrible since at high frequencies, inductance becomes the dominant part of the impedance. So, this is the reason why you have so many grounding vias on RF boards