I'm packin' that tre, but I'm to cold to be square
Ice cubes are square, the square sits inside the tray, the tray sits inside the box, here's your lesson for the day
OK, when you this cold, and you ain't in a nice mood
You put square niggas in a box, ice cube!

from Los – Hustle Hard Lyrics on Rap Genius

Meaning

Los is packin heat, but he’s too cold to be a square, literally in this sense hence ice tray, which he explains, and to further the point, since he’s that cold he’ll put an awkward (square) individual in a coffin (box)

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