When you cum inside of a girl and she reaches her finger up inside her vagina, scoops it out, and flings it back at you.
This fuck Kyle totally Spidermanned me the other day so after he came inside of me last night I totally got him back and pulled a Spider-Ma'am on him.
The traditional way Spiderman greets women, or what he says when holding a door open for a woman. It is a respectful way to differentiate a common phrase while sticking to the light-hearted and whimsical way Spiderman is portrayed.
Spiderman: *opens door for woman* "Spider ma'am.."
Woman: "OMG Thank you Spiderman!"