ぽんぽこ

ぽんぽこと太鼓(たいこ)を鳴(な)らす。

Beat the drum with a full, bursting sound. {sounding of a drum or hand drum, sound of drums, full (stomach), bursting}

ダイエットをしてぽんぽこのお腹(なか)を平(たい)らにするつもりだ。

I'm planning to go on a diet to flatten my full, drum-like belly. {sounding of a drum or hand drum, sound of drums, full (stomach), bursting}

パーカッションを担当(たんとう)する人(ひと)が太鼓(たいこ)をぽんぽこ打(う)っています。

The person in charge of percussion is energetically beating the drum. {sounding of a drum or hand drum, sound of drums, full (stomach), bursting}

僕(ぼく)は最近(さいきん)食(た)べ過(す)ぎている。だから、お腹(なか)はぽんぽこになるべくしてなった。

I've been eating too much lately. Therefore, my stomach has become as full as a drum. {sounding of a drum or hand drum, sound of drums, full (stomach), bursting}

遠(とお)くから太鼓(たいこ)のぽんぽこという音(おと)が聞(き)こえるが、祭(まつ)りでもやっているのだろうか…？

I can hear the sound of a drum beating from afar, could there be a festival going on...? {sounding of a drum or hand drum, sound of drums, full (stomach), bursting}