Not Sure What This is (Demo) lyrics

Then I saw her uuuahhh uuhaaa
Nah nah na

I've been with... with just guitar but like da da da da da da da da
Maybe something like some cymbals like cs cs cs cs cs cs cs
And go like:
[Instrumental]
Bum bum
Bum bum
Bum bum
Bum
Bum bum
Bum bum bum
Bum
Bum bum