A combination of Weimar (a city in Germany and a name for the post WW1 failed German government) and America (the United States). Wei-Merica.
It’s a nickname given to the United States by certain right wingers who believe the nation is taken over by rampant degeneracy and economic collapse, similar to the Weimar Republic.
Wammer is a term used for a highschool and\or college party with more then 75 people and lots and lots of beer,alchol,girls,drugs. Not a sausage party.