Moblogging definitions

From Adam Greenfield, who coined the term in 2002, this definition from 2004
Publish[ing] pictures, sounds, comments, and, yes, full and well-developed thoughts from wherever they happen to be at the time, to whatever network exists to catch them. Hence "mob[ile Web] logging.

From Typepad
Moblogging, short for Mobile Blogging, is the ability to add posts to your weblog while not sitting at a computer.

From Winer & Scoble
Moblogging is any activity that occurs away from your normal blog-writing place whose purpose is to create content for your blog.