When a male is receiving oral sex, The Spider-Man is the act of pulling out his member just prior to ejaculation, then unloading into his own hand and then flinging it in a web-throwing motion directly into the eyes of the one servicing him.
When when a man's having sex with a woman, cums into his hand then slaps it onto her cheek and slowly pulls his hand away. You get that white weby strings between her face and your hand.
G1: "Dude, I totally did The Spider-Man on her cheek!"
G2: "Oh man, what'd she say?"
G1: "She slapped me across the face, called me some nasty names then stormed out."
A sex position invloving the doggie style position where the man pulls out early and cums in his hand. When the woman eventually turns around the mans yells spiderman and throws his sticky web in his partner's face. Correct hand motions are necessary.