[Intro]
Oh, oh no...
Every birthday...

[Chorus]
(Come on!) Oh, she's sweet but a psycho
A little bit psycho
At night she's screamin'
"I'm-ma-ma-ma out my mind"
Oh, she's hot but a psycho
So left but she's right though
At night she's screamin'
"I'm-ma-ma-ma out my mind"

Oh, she's sweet but a psycho
A little bit psycho
At night she's screamin'
"I'm-ma-ma-ma out my mind"
Oh, she's hot but a psycho
So left but she's right though
At night she's screamin'
"I'm-ma-ma-ma out my mind"

[Post-Chorus: Katy Perry]
(Celebrate, celebrate, celebrate...)

[Drop]
Oh, uh, oh...

[Post-Chorus]
So make a wish
I'll make it like your birthday every day
I'll be your gift
Give you something good to celebrate

[Bridge]
Happy birthday...
So let me get you in your birthday suit
It's time to bring out the big balloons

[Chorus]
Oh, she's sweet but a psycho
A little bit psycho
At night she's screamin'
"I'm-ma-ma-ma out my mind"

[Drop]
Oh, uh, oh...

[Post-Chorus]
Oh, no...
Boy, don't pretend that you don't love the pain
Oh, she's sweet but a psycho
A little bit psycho
At night she's screamin'
"I'm-ma-ma-ma out my mind"

Oh, she's hot but a psycho
So left but she's right though
At night she's screamin'
"I'm-ma-ma-ma out my mind"

[Outro]
Grab a cop gun kinda crazy
She's poison but tasty
Yeah, people say "Run, don't walk away"
'Cause she's sweet but a psycho
A little bit psycho
At night she's screamin'
"I'm-ma-ma-ma out my mind"

[Drop]
Oh, uh, oh. Hey, no, no, no...