My grandpa used to walk around the house singing that song. I actually didn't know it was a song till I googled it and found this site. Man I used to think my grandpa was senile. it went:

She was coming 'round a mountain doin' 90 miles an
hour when the chain on her bicycle broke
When we found her in the grass
She had a sprocket up her ass
And her titi was playing dixie on a spoke