DAMN= An emphatic word (sometimes a bit rude but not here). Here it is giving emphasis to the word "mysterious".

GOT= You have got.

SHADES= (slang) Sunglasses.

HEELS= Shoe heels, design to make you look taller (see picture)

EVERYBODY LOOK= This is an imperative form (otherwise, if it were a present tense it should be "everybody looks"). When the subject is "somebody/someone" we use the plural forms "them, they, their, themself" but with a singular meaning to avoid "he" or "she" because "everybody" can be used for male, female or both:
- Everybody look to their left
- If you see anybody there, tell them to come.
- Someone is talking to themself in that room or is it the TV?

WANNA= (coll.) Want to.

PRICE TAG= A little tag attached to something to show its price (see picture).

AIN'T= (coll.) The negative form of the verb to be or to have:
- It ain't expensive = It's not expensive
- You ain't no doctor = You aren't a doctor
- I ain't go no money, man= I don't have any money

CHA-CHING= The sound that a cash register makes when its drawer is closed after money has been put inside. Used in conversation to indicate that the person being spoken about is going to or already has made quite a profit at little expense.

BA-BLING= (slang) "Bling" is flashy expensive jewelry and "ba-bling" is a reference to showing off expensive possessions (also "bling-bling").

LOW BLOWS= An unscrupulous attack; an insult.
This metaphor comes from boxing, where a low blow is an illegal blow that lands below the opponent's waist.

VIDEO HOES= Girls who have sex with Casting directors to get jobs and money. (singular: video ho).

The lyrics here are kind of simple and straightforward: money isn't everything. It's all against modern materialism, when everything and everybody has a price and the more you have the more you are worth. The song says that money is not the measure of everything, in fact, it is the measure of nothing (forget about cha-ching and about ba-bling = making money and showing off your possessions is not important). The important things are loving and enjoying life.

Now, if we see the video you'll find that there is a deeper meaning under the surface. This song is against the materialism of modern life alright, but more specifically against the materialism which is dominating the music industry today. Music used to be all about having fun and making people have fun, but now it is simply an industry to make money. Singers will do anything to get famous and also they look so sophisticated and trained and "professional" that we can seriously doubt they're having any fun at all. Against all this, the singer suggests we should go back to the good old times when everything was just about having fun, not about the money.

The only problem is that to succeed in the music industry, as she says, you must comply to their wishes, you must become a puppet, a marionette in their hands (as the video shows), and that's what Jessie J went through, becoming in the process exactly the same typical product she's criticizing.