verb, adjective · to talk rapidly or at length, often appearing in the compound '噜苏 lū​sū'

你就别在那儿一直噜苏了，大家听得都烦了。

onomatopoeia · to mutter or complain in a low, indistinct voice, often used in the compound '嘟噜 dū​lu'

他嘴里一直在嘟噜着什么，显然很不满。