When two men ejaculate on a woman's face at the same time and try to make sure that their cum is equally distributed on both sides of her face.
Tom and Harry gave Jane a proper plastering; complete facial symmetry achieved.
When two men ejaculate their load onto a woman's face at the same time and try and distribute their cum equally across her face.
"Tom and Harry get Jane a right good plastering there - complete facial symmetry achieved."