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Jyutping dou1 dou1
Pinyin dū dū

Definitions (Wiktionary)
  1. adj, onomatopoeic
    speaking in a low voice; mumbling; muttering
  2. adj, onomatopoeic
    honking; beeping
  3. adj, after certain adjectives, ideophonic
    chubby; plump
  4. adj, ideophonic
    pouting; protruding
Examples (粵典–words.hk)
  1. Cantonese
    电视啱啱播𠮶套戏,啲嘟嘟声仲多过剩低啲对白。
    電視啱啱播嗰套戲,啲嘟嘟聲仲多過剩低啲對白。
    din6 si6 aam1 aam1 bo3 go2 tou3 hei3, di1 dut1 dut1 seng1 zung6 do1 gwo3 sing6 dai1 di1 deoi3 baak6.
    • The television show that aired just now had more censor beeps than the actual dialogue.
  2. Cantonese
    睇下佢,块面肥嘟嘟几得意!我好想锡佢一啖呀!
    睇下佢,塊面肥嘟嘟幾得意!我好想錫佢一啖呀!
    tai2 haa5 keoi5, faai3 min6 fei4 dyut1 dyut1 gei2 dak1 ji3! ngo5 hou2 soeng2 sek3 keoi5 jat1 daam6 aa3!
    • Look at his chubby, lovely face. I really want to kiss him on the cheek!