I mashed up on the glass, I gotta big ol' Lac

from DJ Screw (Ft. Big Moe, Big Pokey, Bird, D-Mo, Haircut Joe, Key-C, K-Luv & Yungstar) – June 27th Freestyle Lyrics on Rap Genius

Meaning

D-Mo’s sipping lean and smoking in his Cadillac, causing what’s known as a “clam-bake” or “hot-box” effect, where the windows are closed and most, if not all, of what the driver/passengers inhale is marijuana smoke.

Mashed up is a phrase meaning combining the effects of two drugs (most commonly weed and alcohol.)

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