Still some
MC's got to feel one
Caps, I got to peel some
To let niggas know
That if you fuck with big-and-heavy
I get up in that ass like a wedgie

from The Notorious B.I.G. – Machine Gun Funk Lyrics on Rap Genius

Meaning

Some rappers need to get shot, so Biggie needs to “peel” (shoot) some “caps” (bullets) at them

Why? To show them that if you mess with “Big-and-Heavy” (a nickname Biggie just insta-created for himself), you’ll feel like your underwear is bunching

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