My classmate S shared this joke she practiced as a younger kid. She went to a French-American school and in lower grades you’d ask someone to say the letters, “J”, “P”, and “T” in a French accent. JPT said in a French is, “Je pe the”, and that sounds like you’re saying “j’ai pété” which means “I farted”.

This clearly indicates a joke within children’s culture specifically based off a play on words. This reminds me of the similar conceit in English of I.C.U.P.; so it indicates a similarly alive kid’s culture.