From WordNet (r) 3.0 (2006):
gab
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 profusely; "she was yakking away about her
grandchildren" [syn: yak, gab]