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A sexual act during which a man covers his penis in peanut butter while his partner fills his/her mouth with jelly and proceeds to perform oral sex upon the penis. Fun for all! YUM!

Special note: While one may use any variety of jelly, it is best to stick to creamy peanut butter. Chunky is simply too dangerous.
male #1: "Damn yo! My girlfriend surprised me with a PB n' BJ last night for my birthday!"

male #2: "Strawberry?"

male #1: "Nah, dude...grape."

male #2: "Sweet."
by ThePasswordIs October 18, 2010
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