The act of filling a white, tube-sock with as much cum as possible, whirling and twirling it like a lasso over your head, and releasing its contents over an excited, or unsuspecting person's face.
The other night my slutty girlfriend turned to me and said, "I'm tired of getting facialized. Tonight I want the slingshot sock." Astounded and wide-eyed, I stammered, "of course!"
Later that evening, while soaking in a pool of vajamba juice, I fucked my girlfriend up until the point of cumming, pulled out, and filled my old tube-sock with man-goo. Whooping and shouting in a frenzy, I twirled the sock and saw cum splatter over my gf's hungry, open mouth.