It is slang for anal sex. The peanut butter is feces, and the jelly is KY Jelly. That's why a baseball bat is mentioned.
"It's peanut-butter jelly-time, peanut-butter-jelly-time, ...peanut butter jelly with a baseball bat."
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Anal sex. Also known as "Santorum-time." Santorum meaning "that frothy mixture of lube and fecal matter that is sometimes the byproduct of anal sex."
Senator Rick Santorum came in, bent over, and stated: "It's peanut-butter-jelly-time!"
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