Starbucks as verb

I read the article"Is RSS Not The Next Big Thing" due to my interest in RSS. However, I'm blogging it due to the following line:

"Last week when I Starbucked with Dave Winer, he emphatically said that "we" don't have to push RSS more mainstream."

My question is this: since when did the act of meeting someone at a Starbucks become the verb "Starbucked"?