babbling, blabbing, cackling, chaffering(British), chattering, chatting, chinning(slang), conversing, gabbling, gassing, jabbering, jawing, kibitzing(also kibbitzing), nattering, palavering, pattering, prating, prattling, rapping, rattling, running on, schmoozing(or shmoozing), talking, twittering, visiting
gossiping, tattlingdescanting, discussing, expatiatingyakking(also yacking), yammering, yapping
blowing smoke, chewing the fat(also chewing the rag), shooting the breeze, talking a blue streak