The Collaborative International Dictionary of English v.0.48:

Chitchat \Chit"chat\, n. [From Chat, by way of reduplication.]
   Familiar or trifling talk; prattle.
   [1913 Webster]

WordNet (r) 3.0 (2006):

chitchat
    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: talk socially without exchanging too much information; "the
         men were sitting in the cafe and shooting the breeze" [syn:
         chew the fat, shoot the breeze, chat, confabulate,
         confab, chitchat, chit-chat, chatter, chaffer,
         natter, gossip, jaw, claver, visit]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "chitchat":
   babble, back-fence gossip, backchat, beauty-parlor chitchat,
   cackle, chat, chatter, chitter, chitter-chatter, clack,
   cocktail-party chitchat, gabble, gossip, gossiping,
   gossipmongering, gossipry, groundless rumor, idle chat, idle talk,
   newsmongering, piece of gossip, prattle, small talk, story,
   table talk, tale, talebearing, taletelling, talk, talkee-talkee,
   tattle, tea-table talk, tittle-tattle