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. Ah, sirrah mistress. Go, sirrah, to my cell. (Shak)
Origin: Probably from Icel. Sira, fr. F. Sire. See Sir.