Coined by Jeff Rowland, author of the Web-Comic OverCompensating, WebCest is defined as something that is "As bad as incest only it happens in Cyberspace"
From OverCompensating, August 2nd, 2005: "Webcest is that special feelin' you get when you're makin' love to your old lady and you're both dressed like giraffes! It's that feelin' you get when you got high-res, glossy printouts of tubgirl and goatse and you're all alone on a school bus."
A form of minor amnesia for when you inexplicably experience the burning urge to look something up and immediately rush to the proper website to look something up only to forget what you wanted to search for.
I was falling asleep on the couch one night, when suddenly, a random thought popped into my head. I rushed to my computer and brought Google up, but by the time I was ready to search for anything, I experienced Webnesia.
Webcest describes actions of a sexual nature that have been made possible only by the internet. Something described as webcest should be disturbing to some large population, as incest is.
Webcest is that special feelin' you get when you're makin' love to your old lady and you're both dressed like giraffes!
It's that feelin' you get when you got high-res, glossy printouts of tub girl and goatse and you're all alone on a school bus.
Webcest is when you find dirty pictures of your ex-girlfriend on the internet and you print them out for later.
Webcest is when you realize that you're wanking off to a distant relative without knowing before.
Webcest is finding a porn site about a girl who looks like your exgirlfriend and bookmarking it.
Webcest is when you realize the fifteen-year-old you've been having cyber sex with is actually your niece.