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Always super-enthusiastically agreeing to plans and always, always flaking.
"Hey John, do you want to come to my daughter's wedding?"
"Yes, absolutely! I've been waiting for you to ask!"
Day of wedding, via text: "I can't make it, my dog is sick with the measles :-( Next time though!"
That's a San Francisco Yes.
by Hebejebelus July 20, 2016
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