I first saw in in Spatch's LJ (click the image). And Googling it leads to the discovery that Boston-area yoots have already adopted the phrase for MySpace usernames and so on.
on the tv ad for recognizing stroke signs, the whole thing is sung in a jaunty little ditty and "bof fri fleu" comes out of a woman's mouth in a speech bubble.
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It's like Boston's very own AYBABTU.
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here's an extended version of the TV commercial: