What's the difference between US English and UK English?
How many Americans speak English without avoiding the grammar?
Nowadays people speak like wassup, hun, bae, lil bit, cash me out how bow dah,etc so I often get confused.
And by the way, bae is the most ridiculous jargon I've ever heard.
Google says bae is a person's boyfriend or girlfriend.
Dictionary says bae is a Danish word for poop.
No offense.

See a translation

There's little to no difference between US English and UK English. Some word pronunciations are different but you'd know what an American is talking about. If you know UK English you won't have a problem with US English. The slang you brought up is never used seriously, it's a joke, anyone who uses that slang seriously is hard to come by, you'd have to be in a small town to hear it. And the word bae is just an example of the natural language progression in English. The English language will take words from another language and add a meaning to put familiarity to it. An example "Naan bread", you're saying "bread bread" but when you say naan bread you immediately think of a specific type of bread. Saying bae to refer to your significant other may be ridiculous in Danish, but we don't speak Danish and we aren't Danish so it isn't exactly normal to associate it with the Danish meaning.