1) Blether 2) Chatter 3) Prate 4) Prattle 5) Yak 1) Cackle 2) Chatter 3) Chatter, prattle or gab 4) Converse 5) Go on and on 6) Noisy talk 7) Slang for a laugh or joke 8) Talk 9) Talk idly 10) Talk on and on 11) Talk, talk, talk 12) Talking 13) To talk incessantly 14) Yakety-yak 
Yack is slang for an exclamation of disgust.
[v] - talk incessantly and tiresomely