The Collaborative International Dictionary of English v.0.48:

Tittle-tattle \Tit"tle-tat`tle\, n. [A reduplication of tattle.]
   1. Idle, trifling talk; empty prattle. --Arbuthnot.
      [1913 Webster]

   2. An idle, trifling talker; a gossip. [R.] --Tatler.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tittle-tattle \Tit"tle-tat`tle\, v. i.
   To talk idly; to prate. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

tittle-tattle
    n 1: light informal conversation for social occasions [syn:
         chitchat, chit-chat, chit chat, small talk, gab,
         gabfest, gossip, tittle-tattle, chin wag, chin-
         wag, chin wagging, chin-wagging, causerie]
    v 1: speak (about unimportant matters) rapidly and incessantly
         [syn: chatter, piffle, palaver, prate, tittle-
         tattle, twaddle, clack, maunder, prattle, blab,
         gibber, tattle, blabber, gabble]