When you kick a bar you spit somethin' that no one’s feelin’
When I kick a bar I’m outside of the strip club belligerent drunk
Kickin’ the bricks on the buildin', uh

from Slaughterhouse – Funkmaster Flex Freestyle Lyrics on Rap Genius

Meaning

When other rappers kick a bar (a rhyme) they spit something that’s wack; when Royce kick a bar he is literally kicking a bar (building).

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