Green’s Dictionary of Slang

(UK black) to stare at or address aggressively.

2005		Jade LB Keisha the Sket (2021) 79: ‘y u screwfacin?’ he sleepily asked.
2020		G. Krauze What They Was 58: Taz [...] starts hyping up, turning to screwface the officer — fucking feds, always harrassing man, it’s coz I’m black innit.