the part of a marijuana (weed, pot, ganja, etc.) pipe in which the marijuana is placed (packed) to be smoked. it may have a little hole (carb) on the side of it, which you cover while you are inhaling the marijuana smoke while holding the whole pipe and smoking.
"i wanna smoke a bowl right now soo bad!"
(british accent)"oh! you guys are smokin a bowl! they're goin to go smoke a bowl! may we smoke with you?"