New York Tri-Borough (Brooklyn, Queens, Bronx) area conjunctive term for an individual portraying themselves with a particular demeanor of being both a schmuck and a self proclaimed expert.
"Yo' Joey, you're a real schmexpert aren't 'ya. We don't like your attitude, and you think you know everything."
(sh-MEX-purt) someone who is a thought leader in the use of and theory of social networking, specifically Web-based tools such as Facebook, Twitter, YouTube and MySpace
My boss thinks I need a Twitter to promote the business, but I was afraid, so I called a schmexpert.