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."