It might seem like I tabbed it in a complicated way, but if you stick to it then you 
get the hang of it. It is actually a really easy song to play. Have fun! (I have an earlier 
but it had some mistakes in it so this should be better)

Intro/chorus:
G|----------------------------------|
D|----------------------------------|
A|-5555555555555555-----------------|
E|-----------------5555555555555555-|x1


verse part 1 ''yeah''
G|---------------------------------|
D|---------------------------------|
A|-2-2-2-202-2-20202-2-2-202-2-2020|
E|---------------------------------|
Note: in this part and in the verse part 3 there are 2's and 0's, not
20's.

verse part 2
G|--------------------|
D|--------------------|
A|--------------------|
E|-3-3-3-33-0-0-00--0-|

then :
G|-------------------|
D|-------------------|
A|-2-2-2-202-2-20202-|
E|-------------------|

Now it will continue like this until the chorus:

verse 1
verse 2
verse 1
verse 2

chorus ''this boy is so..''
G|----------------------------------|
D|----------------------------------|
A|-5555555555555555-----------------|
E|-----------------5555555555555555-| x1

After every chorus verse part 3 ''I wanna car, I wanna car, yeah''
G|-----------------|
D|-----------------|
A|-2-2-2-202-2-202-|
E|-----------------|

verse 3
verse 1
verse 2
verse 1
verse 2

chorus x1
verse 3 x2

bridge:
''I wanna, I wanna, I wanna...''
G|------------------------------------------------------------------|
D|------------------------------------------------------------------|
A|------------------------------------------------------------------|
E|-3333333355555555777777779999999910101010101010101212121212121212-|  x1

In this part, each note is played 8 times fast, just as the 5's
in the chorus. Saves counting them :)
Also, here the scale goes up to ten's and twelve's, not one zero or one two.

After the bridge, continue with this:
verse 3 x2
verse 1
verse 2
verse 1
verse 2

chorus x2

verse 3 x3
Finally, end with this.
G|-------------------|
D|-------------------|
A|-2-2-2-202-2-20202-|
E|-------------------|

And that's it. Simple yet fun.