They strain to sling slang, I'm trained to bring game

from Rakim – The 18th Letter (Always and Forever) Lyrics on Rap Genius

Meaning

While all the others are busy trying to sell dope, Rakim focuses purely on bringing the best rhymes possible.

Also notice the use of alliteration:

“Just when things seem the same, and the whole scene is lame"
"They strain to sling slang

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