A drum bowl is weed and tobacco in the same bowl. Usually smoked out of a bong. Causes the smoker to feel a head rush as well as get high from the marijuana. Experienced drum bowl smokers don't get the same head rush that you feel when you first smoke it but still get the effects of the nicotine. "Drum" comes from the brand of tobacco that was first used for this method. The best drum bowls are made when you grind the weed in a grinder and then distribute the tobacco evenly, about 60% marijuana 40% tobaccs. The proper ratio is commonly disputed but it all depends on preference of taste and wanted effects. Any rolling tobacco will work, the higher quality the better.
Man, I love drum bowls in the morning.