someone who always supports a person born in the same country, state, province or city even if they're a complete tool
tool lover: dude i love jim carrey especially in dumb and dumber
man: jim carrey is such a fucking tool
tool lover: omg he's canadian you antinationalist
man: dude you're such a patriosexual
A specific behavior or peculiar way of expressing pride in one's country that is unique to that country; often seen as inferior or comical by other countries.
The patriosyncrasy of mounting flags in the bed of your truck doesn't follow proper flag etiquette.