1. Britis (noun): someone who is trying to act British badly; a british person who is a butt hole, douch bag, bitch, etc.
2. To Britis (verb): To purposely badly act like a British person
Noun: That actor is a total britis.
Boy, your cousin was acting like a britis when he threw fish and chips at the people walking by his house.
Verb: The actor is being britis so he will not get the role in the movie.