PBJ Views 9 meanings found PBJ is best known as the shorthand for a peanut butter and jelly sandwich, while it also appears in legal contexts as probation before judgement and in internet slang for a 'pretty bad joke' or a friendly sign‑off. Miscellaneous Peanut Butter And Jelly Community Plain Bob Jones Prayer Bible And Journaling Governmental Navy version of WW II B-25 bomber Probation Before Judgement Regional Paama, Vanuatu Internet Peanut Butter and Jelly Sandwich Pretty Bad Joke Peace, Blessings, and Joy