peanut butter and jelly

Short definition from Wiktionary

Noun

1. 1
   Peanut butter and jelly (or jam) that is spread on bread to make a sandwich.
2. 2
   A sandwich consisting of bread spread with layers of peanut butter and jelly.
3. 3
   Used other than figuratively or idiomatically: see peanut butter, jelly.
4. 4
   Alternative form of peanut butter and jelly (“sandwich”).