The Collaborative International Dictionary of English v.0.48:

Persiflage \Per`si`flage"\, n. [F., fr. persifler to quiz, fr.
   L. per + siffler to whistle, hiss, L. sibilare, sifilare.]
   Frivolous or bantering talk; a frivolous manner of treating
   any subject, whether serious or otherwise; light raillery.
   --Hannah More.
   [1913 Webster]

WordNet (r) 3.0 (2006):

persiflage
    n 1: light teasing