Green’s Dictionary of Slang

ejaculation in one’s partner’s face.

1988		H. Max Gay (S)language 14: Facial, to Get a—to perform fellatio.
1998		‘deGroot & Rundlet [D.F. Wallace] ‘Neither Adult nor Entertainment’ in Premiere Sept. 93/3: [f.n. 14] a facial is a money whose skeet is directed onto the partner’s face.
2001		Guardian Weekend 17 Mar. 9: I used not to do facials, but I do them now.
2009		J. Stahl Pain Killers 137: But they would do[...] Greek, Russian, bareback oral or facials.