Green’s Dictionary of Slang

brick adj.

(US black) of weather, cold.

[US]P. Beatty Tuff 44: Yo, it’s brick out there today. Cold as hell.
[US]NY Times 13 Jan. 🌐 Yo, son! IT’s mad brick out!
[US]C. Eble UNC-CH Campus Sl. Spring 2016.