A Wikiquotient is a measure of your knowledge. It is done by clicking the "random page" button on Wikipedia (counting each click) until you come to a page about a subject that you've actually heard of before. Your Wikiquotient is the number of clicks that this took you. For most accurate results, the test should be repeated several times, with the average of the scores being the Wikiquotient. The lower the score, the more knowledgeable you are!
The penis identity is a mathematical equation, or identity: 8=D. The identity is similar to others, such as Euler's identity, in that it uses constants rather than variables. It is occasionally written with multiple "=" for emphasis.
Instead of writing down formulas on my chemistry cheat sheet, I just wrote the penis identity: 8=====D.