noun. A little more than diddily-doodily-squat.
Real citation: "Spader is his scintillating self, a bit puffier (and friendlier) of face, perhaps a semi-smidgen less nasty but full of dirty tricks he longs to play on fellow lawyers, partly just to help keep them from developing simplistic complexes."
(ktdids, Oct 2, 2004, http://brigitte.proboards4.com/index.cgi?action=display&board=Boston&num=1094968383&start=105)
Made-up citation: "Even deep in the bowels of the basement of my soul, I can't find a semi-smidgen of good will towards Adam Sandler or pea soup."