The concept is simple. You take a screenshot of a website, and write something on it - your name - that the website sucks - That a horse took a shit on it -- Anything. Once this is finished, you illegaly own the website.
See the image section for examples.
Let it be known that this trend was started by none other than Gemo.
Website tagging, as of 20th april, thanks to Kyle Welsh and myself also means 'defacing' a website so that it appears thruthful to it's original form, but the content is completely changed. Great examples of this are Kyle's 'Gaygle' and 'Unibrow'(Unicef), and DJ's Mclawsuit.
We are pioneers of this, so let it be known where credit is worth.