The verse can be played with chords. The chorus could be either chords or the tab listed below. 

The song goes like this: 

VERSE:
G
Say what ya say, Nick, you know I'm in it too
G                     F C
It's not like that! 
G  
Say what you say, Nick, you know I love you too
G                     F C
It's not like that!
G        F C 
Yeah, hoo! (x3)


CHORUS: (play it twice)
G             Bb       C
I've got a favorite one
G             Bb       C
I've got a favorite one, ya know
G             Bb       C             D C G
...                     Oh lovely one!

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(During chorus, the tabbed progression goes like this:)
e|-------------------------|
B|-------------------------|
G|-------------------------|
D|-------------------------|    (These notes are G Bb C Bb G F G)
A|-----------1-1-3-1-------|
E|-3-3-3-3-3---------3-1-3-|    (x3) and then...

e|-------------------------|
B|-------------------------|
G|-------------------------|
D|-------------------------|    (These notes are D Db C Bb C Bb G F G)
A|-5-5-5-5-4-3-1-3-1-------|
E|-------------------3-1-3-|    Then you repeat this whole tab.
___________________________________________________________________


And then the rest of the song is just a repeat of the verse and chorus.