At first, this might sound like an odd line, but let me break it down.
The peanut butter is Buk Lau’s rapping styles. Smooth, salty and occasionally sweet. It’s smooth because you don’t see him choke or break flow, it’s salty because the lyrics are a bit edgy and has gotten a few unseasoned people giving him salty looks (Lawry’s), and it’s sweet because his past album, according to him, served him well.
Many people want this while they’re completely different from Buk Lau. Hence, the term “jelly” is formed (also conveniently shorthand for the word jealous). In fact, X’s willingness to work with Buk Lau despite their differences is an example of a PB and J working together. It’s not that X is truly jealous, it’s just Buk Lau’s declaration at the time to all of his doubters.
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