PARTY GIRLS= 'A party girl 'has several levels of meaning. First, it means a girl who has a very busy social life or more often, one whose only interest in life is parties or having fun, somebody who has no serious interests and no 'real' job. It can often mean or imply a girl who drinks too much, uses drugs and sleeps around (sexually promiscuous).

DON'T GET HURT= Don't be injured.

PUSH IT DOWN= (push someone or something down) To force someone or something downward, cause to fall down by pushing.

FOR A GOOD TIME CALL= For having sex. The party girl is not loved, she is like an object, almost a call-girl.

PHONE'S BLOWIN' UP= Your phone is blowing up when you receice numerous phone calls in a short period of time.

1,2,3,1,2,3, DRINK= Sia begins the song with almost a dubious invincibility. The alcohol shield-barrier makes the party girl immune to feeling anything real… or at least until it wears off. She tries to forget with "1, 2, 3, drink".

THEY'RE RINGIN'= They are ringing.

DOORBELL= A bell, chime, or buzzer outside a door that is rung to announce the presence of a visitor or caller.

THROW 'EM BACK= (Throw them back) Return by tossing.

TILL= (Informal) Until.

I'M GONNA= (Informal) I'm going to.

SWING= Oscillate; to move with a relaxed and swaying motion.

CHANDELIER= (from Old French) A branched, decorative lighting fixture that holds a number of bulbs or candles and is suspended from a ceiling. See the picture here. The Chandelier could be a metaphor of life at the top.

I'M GONNA LIVE LIKE TOMORROW DOESN'T EXIST= Interpretation of Horace's Carpe Diem ("Carpe diem quam minimum credula postero" = seize the day, trusting as little as possible in the next day or future); live your life now. 

I'M HOLDING ON FOR DEAR LIFE= (Idiom) To use a lot of effort to keep something. It means, you are holding on to whatever it is, with all the strength of your body (your fingers, hands, and whatever else) because if you let go, your "dear" (precious) life will be in danger of imminent end.

WON'T LOOK DOWN= I will not be in my lower gaze.

KEEP MY GLASS FULL UNTIL MORNING LIGHT= She wants to keep drinking because drinking is a night activity, and she doesn’t want the next day to come. She wants the night to be endless.

WON'T LOOK DOWN, WON'T OPEN MY EYES= The chandelier is swinging so much, she has to hold on tight to it, she’s afraid she doesn’t to look down nor open her eyes. Sia calls for help, because partying too hard can be dangerous for life.

SUN IS UP= The sunrise is here, night is over.

I'M A MESS= I am an emotional wreck. It means the same as to be in a difficult situation or a difficult state of personal matters

GOTTA GET OUT NOW, GOTTA RUN FROM THIS= She probably wakes up with a hangover, everything arounds her make her feel uncomfortable, that’s why she needs to get out and run from the place she woke up to forget what happened.

HERE COMES THE SHAME= Here comes the remorse, the sadness for what I did. Here is the painful feeling of humiliation or distress caused by the consciousness of my wrong behaviour.