But keep a Mac for Scrappy, thinking its just laffy taffy

from J.R. Writer (Ft. Cam'ron & Lil Wayne) – Bird Call Lyrics on Rap Genius

Meaning

J.R. stays strapped with a machine gun because there are always people who think he’s a lightweight. “Thinking it’s candy” is a common way to refer to people thinking you’re easy to rob or beat up and/or “sweet” — i.e. gay — and Laffy Taffy is a kind of candy. 50 Cent uses the phrase on his song “Heat”

Keep thinking I’m candy till ya fucking skull get popped
And ya brain jump out the top like Jack-in-the-box

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