A
flavor of the month word that entirely too many people are suddenly using.
It means something like a custom or belief attributed to a group or class of people, especially one
outmoded. (Thanks
Oxford)
I propose that it should mean someone who uses trendy 'new' words to fit in with the current blog crowd using the same damn word, relentlessly.
"
God damn, did you see that Shibboleth? He started saying every new
blog buzzword of the day like it was going out of style. What a Shibboleth."