Top Definition
the belief in your bros as your whole universe; usually a result of a lack of belief in anything else (atheism).

Religious services take place on Friday, Saturday, or any day that you can get shit-faced on. Communion is the drinking of beer and the eating of chili-cheese anything. Prayer is addressed to the Holy Dude (who may or may not drink Caucasians), and usually occurs as a result of a long night of partying: "Oh Dude, I should not have eaten El Gigante* after that Power Hour."

*7 lb. burrito
"Dude, do not steal Robbie's girlfriend. Don't you remember the first commandment of Brotheism? 'Do unto thy Bros as you would have them to unto thee.'"
by Cardinal Brovellecci November 01, 2011
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