It stems from someone with a huge ego and low self-esteem.  When the tables turn, you better be able to take it as well as you give it.  Show up to the party, and ruin it for everyone that didn't know just how less they are than you.  Cool just is and usually the person acting the hot shot is really spineless and weak.   In short... you just don't know how un-cool you really are, ignorance was bliss and now I'm about to learn you a lesson.  It was your party, I've shown up and you have no choice to watch me in my glory.   What a fun way to live.

THERE'S A GOOD REASON THESE TABLES ARE NUMBERED HONEY, YOU JUST HAVEN'T THOUGHT OF IT YET

Please, leave all overcoats, canes and top hats with the doorman.
From that moment you'll be out of place and underdressed.
I'm wrecking this evening already and loving every minute of it.
Ruining this banquet for the mildly inspiring and...

When you're in black slacks with accentuating, off-white, pinstripes
Whoa, everything goes according to plan.

I'm the new cancer, never looked better, you can't stand it.
Because you say so under your breath.
You're reading lips "When did he get all confident?"Haven't you heard that I'm the new cancer?
Never looked better, and you can't stand it!

Next is a trip to the, the ladies room in vain, and
I bet you just can't keep up with these fashionistas, and
Tonight, tonight you are, you are a whispering campaign.
I bet to them your name is "Cheap", I bet to them you look like shh...

Talk to the mirror, oh, choke back tears.
And keep telling yourself that "I'm a diva!"
Oh and the smokes in that cigarette box on the table,
they just so happen to be laced with nitroglycerin.

I'm the new cancer, never looked better, you can't stand it.
Because you say so under your breath.
You're reading lips "When did he get all confident?"

Haven't you heard that I'm the new cancer?
Never looked better, and you can't stand it!

And I know, and I know, it just doesn't feel like a night out with no one sizing you up.
I've never been so surreptitious, so of course you'll be distracted when I spike the punch.