Green’s Dictionary of Slang

(US black) to stare at aggressively.

2011		G. Hayward Corruption Officer [ebook] Ch. 6: Inmates were [...] either laughing at me or ice grilling me.
2012		‘Dutch’ ? (Pronounced Que) [ebook] Shameeq looked over and saw Don still grilling him.
2022		J. Hannaham Didn’t Nobody Give a Shit 50: A few of the ladies were grilling her like she didn’t belong.