I empathize. My wife keeps teaching me Austrian slang, I speak like, BARELY any German and a bunch of other languages. I've just accepted I'm always going to both confuse and be confused. I usually opt to be quiet.

I get this. Slang can be really difficult in that the context doesn’t always translate. Indian & American sayings often have roots in British English which makes it far easier but I struggled w/slang in French & chose to stay quiet when visiting France & Belgium.