The art of having a sly wank unnoticed by the surrounding public, ideally practised on public transport, shopping malls or places of authority. Aimed at the gender/animal of your choice.
Mummy why has that person gone red in the face? Ignore him Beatrice, I think he's incocknito
Going on Google Chrome or any browser that has a "no history recorded" mode, (called incognito mode on Chrome), and watching sexually explicit videos, usually to stop people from knowing that you've been watching it.
"I was watching porn on the family computer, so I had to go incocknito mode."
A mode in Google's new Chrome browser that does not record history, search entries or cookies to the user's computer. Downloaded files are still saved as normal.