Hi! I'm translating a book, and I met these expressions, which I really dont understand

So, I actually need help with those! If you can explain theirs meaning, I would be very very grateful to you!!
Here they are (I'm underlining them):
1). She was holding a lager and
black.2).
Them what has, gets.3). I got an
A3 for my essay. (I know that A means the highest mark, but what does mean A3?)
4). Take a
self-urging breath.
5). to be
consumed by fire.6).
purple pop singers.7).
steep in spitiruality8).
If they could hang, they could trip on it (This is a line from the song "Alphabet Street" by Prince, but I cant get what does it mean)
9).
Def me out.10). He had more than enough time to
make one hell of a night out of it.