咕嘟
gū​dūgū​du

[gurgling]

gū​dū [gurgling] · to simmer
  1. 咕 gū adverbverb
    [sound of birds or stomach]
    (onomatopoeia) Mimics the clucking of a hen, the cooing of a pigeon, or the rumbling of an empty stomach; often used in doubled form as 咕咕 gū​gū
  2. 嘟 dū adverbadjective
    toot
    The sound of a whistle, horn, or siren

gū​du to pout
  1. 咕 gū verb
    to mutter
    To mumble or mutter in a low voice
  2. 嘟 dū
    to pout
    To purse one's lips together and push them forward, usually to show annoyance or unhappiness