当番とうばん
tōban

Noun
no-Adjective

1. being on duty; person on duty; one's turn

先月せんげつ日直にっちょく当番とうばん全部ぜんぶわたくしけたかたちでエスケープした野郎やろうだ。
sengetsuno nicchokutōban zembu watashini oshitsuketa katachide esukēpu shita yarōda
He's the pest that, on last month's class-help day, escaped leaving me with all the work.