Having masterbated, and caught the majority of sperm in your hand, you then launch your sperm in the required direction....just like spiderman does with his web!
That kid was doing my nut in, so I'd thought I'd get him back whilst he was asleep with a spiderman!
as a man climaxes while haveing anal sex, he cums in his hand while simultaneously spitting on the chicks back. As she turns around he takes his hand and flings his load in the upset females face. Mimicing a web.
Your having sex doggystyle with a girl and right before you cum you pull out and cum in your hand, then you tell the girl to turn around and you throw it in her face, hence the name spiderman.(not reccomended if this girl is your girlfriend and/or life....unless shes really kinky)
you should've been at my izacs party last night. i had sex with this girl and did the spiderman, hahaha she was pissed!