Trump could become Mr. Brexit

Early Thursday morning, Republican candidate for president Donald Trump wrote a cryptic tweet. 
It read, "They will soon be calling me MR. BREXIT!"
Almost immediately, the title began trending on Twitter and jokes flooded social media, each more confused than the last. But, there is a method to this that's one example of Twitter madness.
Trump is most definitely referring to the United Kingdom's June vote to leave the European Union, and most probably how the results surprised many because