A term used in the 3rd Person Shooter, Gears of War.

A "Spiderman" is the act of getting a headshot on your opponent while they are in the last 2/3 of their roll, making it appear as if your opponent is doing a headstand.

Mostly done with the Sniper, but also uncommonly can be done with a Shotgun and a Pistol.
In GoW2, Torque Bow is capable of this headshot as well.

Origin is not known but many speculate that it was coined "Spiderman" because the actual character, Spiderman, hangs upside down when suspended from a web.

when you're hungover as shit after a spending a night drunk as a skunk

When you cum in the ass and after you pull out they blow fart the cum back on you sticking to whatever it lands on first.

The act of tying up your sexual partner and face fucking them, until you finish on his/her face in the shape of a web.

Breast enlargement for a movie role.

getting drawn on by other people when you pass out at a party. the design they draw is like spiderman.