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1.
What happens when two or more San Franciscans start talking about San Francisco.
“Isn’t it great that we live in the Bay Area?” “Yes, it is, isn’t it? Look at the sun setting over the fog-enveloped bridge” “Look at Mt. Tam!” “Look at that multi-racial lesbian couple doing tai-chi!” “Look at those guys in assless chaps!” “Yes, it’s all so wonderful, I can barely drink my Fair-Trade soy latte with shavings of sustainably grown chocolate mejicano without crying!” “Uh Oh, I think we have bayarrhea!” “What are you a war-mongering, baby seal clubbing, conservative or something!?”
by Jesse Hattabaugh December 19, 2006
 
2.
When a group of San Franciscans get together to congratulate themselves on how proud they are to live in the best place on Earth. Bayarrhea often occurs when people need reassurance of their decision to live in the Bay Area, as most people (at least before the Internet boom) did not move there for work, but rather just because of the appealing lifestyle.
Bayarrhea can be illustrated through the following converstion: "Isn't it great that we live in the Bay Area?" "Yes, it is, isn't it? Look at the sun setting over the fog-enveloped bridge." "Look at Mt. Tam!" "Look at that multi-racial lesbian couple doing tai-chi!" "Look at those guys in assless chaps!" "Yes, it's all so wonderful, I can barely drink my Fair-Trade soy latte with shavings of sustainably grown chocolate mejicano without crying!"
by RinSF May 05, 2008