peanut butter (= a soft food made from crushed peanuts) and jam (= a soft sweet food made from fruit and sugar), or a sandwich with these inside. PB&J is short for peanut butter and jelly.

We made PB&Js for the kids and their friends. 我们为孩子和他们的朋友们做了抹有花生酱和果酱的三明治。