Tirelire literally translates to "piggy bank". It's a charming and somewhat unexpected word to find in a song, especially one with a playful, school-themed context.
In "Litanie Des Écoliers," the lyrics invoke "Saint Tirelire" (Saint Piggy Bank) with the plea, "Que Grammaire nous fasse rire!" (May Grammar make us laugh!). This whimsical personification of a piggy bank as a saint, associated with making grammar enjoyable, makes it a memorable and unique choice that stands out from more common vocabulary.
Grégoire's "Litanie Des Écoliers" is such a charming and relatable song, especially if you've ever been a student! It's essentially a playful prayer from students to various saints, asking for help with all the common school struggles. They're not asking for anything too serious, but rather for those everyday wishes that make school life better.
For example, they ask Saint Anatole that "Que légers soient les jours d'école!" [May school days be light!] and Saint Amalfait that "Que nos devoirs soient bien faits!" [May our homework be well done!]. They even ask Saint Tirelire that "Que Grammaire nous fasse rire!" [May Grammar make us laugh!] and Saint Siméon to "Allongez les récréations" [Lengthen recess]. The song ends with the ultimate student wish, asking Sainte Clémence that "Que viennent vite les vacances!" [May holidays come quickly!] and Sainte Marie to "Faites qu'elles soient infinies!" [Make them infinite!]. It's a really sweet and funny look at the hopes and dreams of students everywhere.