ass web 

when someone jizzes in your ass and you immediately fart causing it to form like a spider web, if you sweat it will leave little droplets like dew on a spider web. If you keep it in your ass you can preserve it and spread your ass cheeks apart and display it and it is still a web. You could also leave it somewhere, like after you sit down you could leave it on the seat and it leaves a web-like sticker.

For Example:
"Hey Lexi I got a nice ass web when my boyfriend and I were doing anal last night"
"Really?! I've always wanted one!"
"I know, it's totally cool, wanna see?!"

ass web by Evangeline Ingle August 5, 2013