Best definition
A Person Who Tries o’ so very hard to be “British” This person is usually Shuned by everyone who is

really British

WannaBrit: Wato Mates! 😀

RealBrit: STFU you Wanna-Brit!
Wanna-Brit: define #2
A person that enjoys acting British (even when it’s painfully obvious that they’re not). They use terms like cheerio, mate, loo, etc. and speak with fake accents.
Wannabrit 1: Bloody ‘ell, my knickers are riding up my bum.

Wannabrit 2: Blimey, we’ve got to get you to the nearest loo, mate!