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1.
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."
by blazingbotany January 27, 2010
 
2.
Where a person smokes a bowl and jumps right into the shower after.
Bro, I did a showerbowl last night and it felt so relaxing.
by gabzillatron November 15, 2011