burble

burble
/ˈbɜ:bl; `bəbl/ v
1 [I] make a gentle murmuring or bubbling sound 发出沙沙声; 发出汩汩声.
2 [I, Ipr, Ip]
~ (on) (about sth) speak in a rambling manner 东拉西扯地说
    What's he burbling (on) about? 他在胡扯些什麽呀?

牛津英汉双解词典