It is an American term...
What we call FLASH they call STROBES...
So as he plays with off camera flash(strobes) he is called the STROBIST...
Strobists do it with the light on!![]()
in a flash![]()
flash exsposure 
The whole Strobist thing is really about using a flash Off Camera which is the real theme / technique behind the term and the blog / website ....![]()

I know...
But we are having fun...
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I hear it banded about but i have no idea what it is or what it means?