Someone who embarasses (themselves and) their
country with rude, stupid, or inappropriate behaviour, particularly in the
news or when travelling abroad. Can also refer to someone who is zealously
patriotic; often a politician or sports reporter.
Do you ever notice that the flagwarts always get tickets in the first three rows at the olympics?
Only a flagwart would wear a
USA jersey to a Brazil/Argentina soccer match.
Did you see that flagwart on CNN? He's so wrapped in the
flag, it almost strangled him.