Phineas: Bow, Chicka, Bow-Wow!
Candace: That's what my baby says!
Phineas: Mow-mow-mow!
Candace: And my heart starts pumping!
Phineas: Chicka-Chicka, Choo Wap!
Candace: Never gonna stop!
All: Gitchee Gitchee Goo means that I love you!
Phineas: I said a Bow, Chicka, Bow-Wow!
Candace: That's what my baby says!
Phineas: Mow-mow-mow!
Candace: And my heart starts pumping!
Phineas: Chicka-Chicka, Choo Wap!
Candace: Never gonna stop!

All: Gitchee Gitchee Goo means that I love you!
Gitchee Gitchee Goo means that I love you!
Gitchee Gitchee Goo means...
That I love you baby, baby, baby!
Ferb: Baby-baby-baby-baby.
Candace/Phineas: Gitchee Gitchee Goo means that I love you!

Full Version Edit
Gitchee Gitchee Goo (Extended Version)

Phineas: Bow, Chicka, Bow-Wow!
Candace/Ferbettes: That's what my baby says!
Phineas: Mow-mow-mow!
Candace/Ferbettes: And my heart starts pumping!
Phineas: Chicka-Chicka Choo Wap!
Candace/Ferbettes: Never gonna stop!
All: Gitchee Gitchee Goo means that I love you!

Phineas: My baby's got her own way of talking,
Whenever she says something sweet.
And she knows it's my world she's a-rockin',
Though my vocabulary's incomplete!
I know it may sound confusing,
Ferbettes: Ooh!
Phineas: Sometimes I wish she'd give it to me straight!
But I never feel like I'm losing,
Candace/Ferbettes: Losing!
Phineas: When I take the time to translate!

All: Here's what I'm talkin' 'bout!
Phineas: Bow, Chicka, Bow-Wow!
Ferbettes: That's what my baby says!
Phineas: Mow-mow-mow!
Ferbettes: And my heart starts pumping!
Phineas: (Oh) Chicka-Chicka, Choo Wap!
Ferbettes: Never gonna stop!
All: Gitchee Gitchee Goo means that I love you!

Phineas: Well I don't know what to do!
Candace: I don't know what to do.
Phineas: But I think I'm getting through!
Candace: I think I'm getting through.
Phineas: 'Cause when I say I love you...
Ferbettes: When I say I love you!
Phineas: She says, "I Gitchee Gitchee Goo you too!"
Candace/Ferbettes: Gitchee Gitchee Goo you too!
Phineas: Gitchee Gitchee Goo you too!
Candace/Ferbettes: Gitchee Gitchee Goo you too!

Phineas: Don't need a dictionary!
Phineas: Bow, Chicka, Bow-Wow!
Candace/Ferbettes: That's what my baby says!
Phineas: Mow-mow-mow!
Candace/Ferbettes: And my heart starts pumping!
Phineas: Chicka-Chicka, Choo Wap!
Candace/Ferbettes: Never gonna stop!
All: Gitchee Gitchee Goo means that I love you!
Phineas: I said, a-Bow, Chicka, Bow-Wow!
Candace/Ferbettes: That's what my baby says!
Phineas: Mow-mow-mow!
Candace/Ferbettes: And my heart starts pumping!
Phineas: Chicka-Chicka, Choo Wap!
Candace/Ferbettes: Never gonna stop!
All: Gitchee Gitchee Goo means that I love you!
Gitchee Gitchee Goo means that I love you!
Gitchee Gitchee Goo means...
That I love you baby, baby, baby!
Ferb: Baby-baby-baby-baby.
All: Gitchee Gitchee Goo means that I love you!