It's a song from Phineas and Ferb.
Phineas and Ferb - S'Winter (Song)

Phineas and Ferb - S'Winter (Song)


Bum bum, bum bum, bum bum, bum bum

It's summer and winter together. It's S'Winter!

Well, there's snow on the ground

There's sleigh bells all around

But the sun's beating down

'Cause it's... S'Winter (Ba dum).

It's ski and snowball fight-time

And also fly a kite-time

Cold and sunny, yes, that's right, I'm

Talkin' 'bout S'Winter.

It's a S'Winter S'Wonderland

Unusual and grand

You can freeze while you get tanned

Because it's S'Winter (Bum bum, bum bum)

Talkin' 'bout S'Winter (Bum bum, bum bum)

It's so S'Winter (Bum bum, bum bum)