[MSL]

What's 'Brexit'

  Do you know about Brexit? What's this: Brexit is the British withdrawal from the European Union. It's often shortened in this way (i.e. to 'Brexit'). It is a portmanteau of Britain' (or 'British') and 'exit').
 A similar word -- 'Grexit'. (More about the Grexit: https://en.wikipedia.org/wiki/Greek_withdrawal_from_the_eurozone).

[SEO]

Brexiteer

And there is a word.

A new word about it

That word is Brexiteer (i.e. from 'Brexit' + '-eer'). Pronunciation: /brɛksɪˈtɪə/. It's a new English word. It means a person who is in favour of the United Kingdom (UK) withdrawing from the European Union (EU).

I learned well about it from https://en.oxforddictionaries.com/definition/Brexiteer.