1. Adverb (fukushi), Adverb taking the 'to' particle

   fiercely (e.g. of a fire burning)

   Onomatopoeic or mimetic word

   火がぼんぼん燃えている。

2. bong-bong (of clock ringing)

   Onomatopoeic or mimetic word

3. with repeated bangs (e.g. of fire cracker)

   Onomatopoeic or mimetic word

4. Noun

   striking clock

   AbbreviationOnomatopoeic or mimetic wordsee ぼんぼん時計

5. green young man from a well-to-do family

   Kansai dialect

Also written ボンボンbonbon