2828380 jmdict A [id=2192216] シュッシュッポッポ;シュッシュッポッポッ;しゅっしゅっぽっぽ;しゅっしゅっぽっぽっ [1][adv-to][on-mim] chuff-chuff (sound of a steam engine); choo-choo; chug-chug; puff-puff [see=2828305・ぽっぽ[1]]