To do your girl doggy so she cant see you then pull out just before cumming and cum in your hand, call your girls name then unleash your jiz onto her face in the same way spiderman spins a web.

When someone goes to the gym and spends 90% of the time on their phones scrolling through social media

The act of jerking off into your hand and then throwing it at your friend's face who has passed out at a party. You must yell "web barrage" as you fling your jism at his face and than yank your hand in backwards motion, just like spidey. The act is considered borderline gay due to the symbolism. (Webbing a dude and pulling him towards you = you secretly want him)

When you can sense something wrong has occurred or is about to occur. You sense danger is approaching and you have a physical reaction to the impending danger.

spidermanning is when you're banging a bitch from behind- you quietly blow your load in your hand, -spit on her back so that she thinks you finished, than call her name so that she turns around, and you hurl your jism into her suprised face like spiderman shoots his web. The spidermanning is even more complete if you sing the spiderman song as you are doing so.

When you nut on your hand and slap a girls ass or any other part of her body so the cum resembles a web

verb. when a man or a woman is so drunk that they need to use the wall to get across the room and keep from falling over. It only becomes 'spider-manning' when the person places both hands on the wall and shuffles their way across, like when Spider-Man crawls along walls.