Hey Caruso

Steamroller is a term used by smokers of cannabis to describe a type of pipe that consists of a hollow tube with both ends open, and a bowl on one side near one end. It is presumably called this because of its resemblance to the front wheel of the piece of machinery. A steamroller is used by filling the bowl with cannabis, putting one's hand over the end of the pipe nearest the bowl, putting the other end in one's mouth, lighting and inhaling until the chamber is filled with smoke, and then removing one's hand from the end and quickly inhaling the collected smoke.

Here's one guy's pic, here's a couple of mine, and here's a drawing. I'll look for a better pic.