Sung to the tune of Let It Snow:

Oh my stomach sure is upset
And the Tums just aren’t working
I really would like to fart
Let It Blow! Let It Blow! Let It Blow!

Update: Seems I got this wrong, the first part rhymed better per the Queen so it should be:

Oh my stomach sure is hurtin’
And the Tums  they aren’t a workin’
I really would like to fart
Let it Blow! Let it Blow! Let It Blow!