hi... i know this isn't the best (pretty far, actually) but i think it sounds good 
enough to me. =)

i didn't get it from the video or anything (too much screaming) so until someone 
does a better tab, this is what you have.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

intro: (strum once) G C G

  D                                            G
i want a hippopotamus for christmas 
   D                                    G
a hippopotamus is all i want
   Bm                                 
i don't want a dog or a rhinoceros 
F#m
all i want for christmas is a hippopotamus
           G                A                 D
and a hippopotamus wants me too

 D                                            G
i want a hippopotamus for christmas 
   D                                    G
a hippopotamus is all i want
   Bm                                 
i don't want a dog cuz dogs are such a fuss 
F#m
all i want for christmas is a hippopotamus
           G                A                 D
and a hippopotamus wants me too

          Bm                      A
i can see me now on christmas morning 
Am                             D
creeping down the stairs
        C                            
and because i looked surprised
             D
when i open up my eyes
             C                  D
i see a hippo hero standing there

  D                                            G
i want a hippopotamus for christmas 
   D                                    G
a hippopotamus is all i want
   Bm                                 
i don't want a dog no rhinoceros 
F#m
all i want for christmas is a hippopotamus
           G                A                 D
and a hippopotamus wants me too

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
joe jonas wants a hippopotamus...

...i want joe jonas =)