when you're fucking your girl and about to cum, pull out and shoot it in your hand. Make the "spider-man" web slinging hand and fling it on the girls face (or ass, tits, whatever) while making the "pfffft" web slinging sound.

When you eat dirt for the first time and leave your family to build a shack in the woods

webslinger the art of ejaculating in one's hand then throwing in a female's face in the style of spiderman.

Someone who creates webpages in mass quantity.

Web slinger
A careless masturbater who needs to rid himself of the evidence of his illicit wank by a spiderman flick of the wrist sending the jiz hurtling through the air

The webslinger is when your wife or gf won't give you any play, so you retire to the bedroom and sit on the corner of the bed and jerk off. Once she opens the door, you fling the cum directly at her face using the "Spiderman" hand gesture.

Overused cell phone