New member here but long time smoker. Recently had some friends over and ripped the bong with them. I'm a medical marijuana user and prefer bongs. Anyway when we were rippin it one of my friends my bong is "old school" and "glass on glass is out" and I don't know what the hell he was talking about. Can someone fill me in? I have a few bongs and all just have the stem that fits in the female piece of the bong. Help me out here? Thanks in advance - rippin a joint now. Lol.