a dirty flow over the beat
Making it sound so sweet but septic

Labrinth - Meanest Man lyrics meaning

Meaning

Although better known for singing than rapping, Ed lays down a tight 16 bar rap verse; rapping is all about "flow", which is the rhythmic and rhyming patterns used in lyrics.

In slang, a dirty flow and a sick beat means he's rapping well on a good instrumental, and it sounds sweet; but Ed is also using the adjectives "dirty" and "sick" in their literal sense, saying that it's septic (infected) in the context of illness.

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