What does I am the peanut butter and your jelly mean?

"I am the peanut butter and you are my jelly" is a phrase used to express a strong bond or compatibility between two people. The phrase likens the two individuals to peanut butter and jelly, which are often considered a perfect combination. When someone says "I am the peanut butter and you are my jelly," they are suggesting that they and the other person complement each other perfectly, just as peanut butter and jelly do in a sandwich. It implies a deep connection and mutual understanding between the two individuals.