n. a term of address to an inferior male or more commonly a child. A modern day equivalent would be "little man".
the GNU version of the Collaborative International Dictionary of English
n. A term of address implying inferiority and used in anger, contempt, reproach, or disrespectful familiarity, addressed to a man or boy, but sometimes to a woman. In sililoquies often preceded by ah. Not used in the plural.
The Century Dictionary and Cyclopedia
n. A word of address, generally equivalent to “fellow,” or to “sir” with an angry or contemptuous force.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. formerly a contemptuous term of address to an inferior man or boy; often used in anger
Word Usage
"You should see some of OUR outfits before you knock biker shorts, sirrah."