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."
by MANGLOR August 14, 2005