a bubbler is a pipe and bong mix. the end has a little bubble usually that has a bowl to hold wahtever you want to smoke and at the bottom of the bowl is a stem that leads to water . then the rest is like a normal pipe. you light the bowl and inhale (this brings the smoke through the water) and keep on until there is the amount of smoke u want to inhale. then u let go of the carb and suck it all down. its really hard to explain waht they look like so here is a link to pics
http://shop.grasscity.com/shop/grass...rice/to=n.html
i personally do not have a bubbler but i have tried one and it was AWSOME. hope this helps