WTF Primer

For the sake of my friends and family in the US who might be wondering WTF is going on over here (I mean, what are we voting on, and why, and what’s at stake?), I thought I’d post a primer on WTF is happening, and how we got here.
In case you haven’t been paying attention over the past two years:
David Cameron wanted to prove he had a bigger dick than Boris Johnson (he doesn’t) so he called a Referendum, in which the people of Great Britain were asked if they wanted to stay in the EU or leave....