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.