Certainly, kids today don't have fun in the way they used to. This boy is funny or a worrying psychological case? You decide :)

You can watch a lyrics video of the song here: Teenage Dream - Katy Perry

Note: this is a good example (or actually, a terrible example) of "lip-sync". Lip-synching is short for "lip synchronization", a technique where you move your lips and pretend to sing, but you're not really singing, the music and the voice is a recorded track. (in some countries they call this "playback", but in English, playback is simply the act of playing back (again) a previously recorded sound, usually so as to monitor its quality.

You think I'm pretty
Without any make-up on
You think I'm funny
When I tell the punch line wrong
I know you get me
So I'll let my walls come down, down

Before you met me
I was a wreck
But things were kinda heavy
You brought me to life
Now every February
You'll be my valentine, valentine

Let's go all the way tonight
No regrets, just love
We can dance until we die
You and I
We'll be young forever

You make me
Feel like
I'm living a Teenage Dream
The way you turn me on
I can't sleep
Let's run away
And don't ever look back
Don't ever look back

My heart stops
When you look at me
Just one touch
Now baby I believe
This is real
So take a chance
And don't ever look back
Don't ever look back

We drove to Cali
And got drunk on the beach
Got a motel and
Built a fort out of sheets
I finally found you
My missing puzzle piece
I'm complete

Let's go all the way tonight
No regrets, just love
We can dance until we die
You and I
We'll be young forever

You make me
Feel like
I'm living a Teenage Dream
The way you turn me on
I can't sleep
Let's runaway
And don't ever look back
Don't ever look back

My heart stops
When you look at me
Just one touch
Now baby I believe
This is real
So take a chance
And don't ever look back
Don't ever look back

I'ma get your heart racing
In my skin-tight jeans
Be your teenage dream tonight

Let you put your hands on me
In my skin-tight jeans
Be your teenage dream tonight

You make me
Feel like
I'm living a Teenage Dream
The way you turn me on
I can't sleep
Let's runaway
And don't ever look back
Don't ever look back

My heart stops
When you look at me
Just one touch
Now baby I believe
This is real
So take a chance
And don't ever look back
Don't ever look back

I'ma get your heart racing
In my skin-tight jeans
Be your teenage dream tonight
Let you put your hands on me
In my skin-tight jeansBe your teenage dream tonight

(by Katy Perry)

MAKE-UP= Cosmetics.

THE PUNCH LINE= The most funny line in a joke, the one that makes you laugh (usually at the end of the joke)

YOU GET ME= You reach my soul, you make me feel something for you.

I'LL LET MY WALLS COME DOWN= I'll stop being suspicious and let you love me.

A WRECK= A disaster, a person whose life is a mess.

KINDA= (informal spelling) kind of = more or less.

FEBRUARY= The usual pronunciation (both in BrE and AmE) is /febrʊərɪ/ or /febrərɪ/ but there is also an alternative pronunciation that they use in this song: /febjʊərɪ/

YOU'LL BE MY VALENTINE= On Saint Valentine's Day (February the 14th), in many countries celebrate the day of lovers, so that day in February, your lover is "your valentine". If you find a new lover, they'll be your valentine in February, as the song says.

LET'S GO ALL THE WAY= Let's have no limits.

YOU TURN ME ON= (informal) You excite me (sexually or causing an interest).

CALI= The third largest city in Colombia, a touristical destination with lots of night clubs.

GOT DRUNK= (drink-drank-drunk) Drank too much alcohol.

BUILT A FORT OUT OF SHEETS= (we) made a fortress using the sheets in our bed (just a "poetical" figure).

I'MA= (coll. AmE) I'm going to.

RACING= Going very fast, like in a sports competition.