And when it come to bein' trill, I'm the litmus test
Bun B is the measuring stick used to determine how trill (true and real) someone is, which means that he is the trillest.
A litmus test is also used to determine pH labels (acid and alkaline materials), and while phat isn’t exactly a term widely used anymore — it’s still pretty clever.
Also, the ends of the pH scale are red (acidic) and blue (alkaline). Red and blue are also the colours of North and South Houston, where Bun B is from.
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