sis boom bah

US dated

(US, cheerleading) An exclamation of encouragement. / (dated) The characteristic sound made by fireworks.

Japanese Meaning

応援の掛け声としての叫び / （古風な表現）花火の発射音を模倣した擬音

At the pep rally, the cheer squad led the crowd in a loud sis boom bah to get everyone excited.

応援集会で、チアリーダーたちはみんなを盛り上げるために大きく「がんばれ！」と声を上げた。

Sense（1）

(US, cheerleading) An exclamation of encouragement.

Sense（2）

(dated) The characteristic sound made by fireworks.