Spider webbing is the act of cumming on a man's beard. This can be either done in a pattern or a straight shot, otherwise known as Charlotte's cumshot.
Person 1: "I am going to fuck the shit out of your stupid face you dirty man slut."
Person 2: "I want you to cover my face in your spider webbing while you tell me how small my cock is"
Person 3: "Im going to shove a shampoo bottle up your asshole"