A bowl(s) of marijuana that is smoked before or while the smoker is taking a shower. The benefits of a shower bowl include but are not limited too,
-No chance of smelling like cannabis after you have taken your shower.
-Legitimate excuse for red eyes
-Fan in the bathroom gets rid of a lot of smoke/smell.
"BazinBotany420 : dude i just took a shower bowl, it rocked.
hashcity420 : nice."