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

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "persiflage":
   aphorism, apothegm, backchat, badinage, banter, bon mot, boutade,
   bright idea, bright thought, brilliant idea, chaff, conceit, crack,
   cross, epigram, exchange, facetiae, flash of wit, flight of wit,
   fooling, fooling around, gibe, give-and-take, good-natured banter,
   happy thought, harmless teasing, jape, jest, jive, joke, josh,
   kidding, kidding around, mot, nasty crack, play of wit, pleasantry,
   quip, quips and cranks, raillery, rallying, repartee, retort,
   ridicule, riposte, sally, scintillation, smart crack, smart saying,
   snappy comeback, sport, stroke of wit, turn of thought, twit,
   wisecrack, witticism