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

The song goes like this:

VERSE:
GSay (320003@1)what ya say, Nick, you know I'm in it too
G (320003@1)                   FC
It's not like that! 
G (320003@1)
Say what you say, Nick, you know I love you too
G (320003@1)                   FC
It's not like that!
G (320003@1)      FC 
Yeah, hoo! (x3)

CHORUS: (play it twice)
G (320003@1)           Bb (x1333x@1)     CI've (x32010@1)got a favorite one
G (320003@1)           Bb (x1333x@1)     CI've (x32010@1)got a favorite one, ya know
G (320003@1)           Bb (x1333x@1)     C (x32010@1)           DC G... (320003@1)                    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.
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And then the rest of the song is just a repeat of the verse and chorus.