Keep it 100, I'mma dime, like, 10 times
Be the first to run if I hear some lead fly

from Das Racist (Ft. Diplo) – Happy Rappy Lyrics on Rap Genius

Meaning

An attempt to reconcile his desire to “keep it 100” (remain authentic) with his fear of gunshots

“I'mma dime, like, 10 times"
100=(10 cents)X(10)
While "dime” is a positive designator used more often with women, Heems is saying his physical prowess scores a 10 out of 10.

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