I don't think it is quite that silly, if you read the Gaelic version. It goes

She is my love, Fair Mary,
Beautiful Mary, topic of my story.
Love of my heart, Fair Mary,
And I'm going to her wedding

I fell in love last night
My heart was high on a peak
Fair Mary, by my side, singing
And I'm going to her wedding

Golden curls, and warm eyes
Narrow eyebrows and high cheeksMouth, sweetest singing tunes
And I'm going to her wedding

It is there at the ceilidh at the Mod,
I became acquainted with the maid
And she won the gold coin
And I'm going to her wedding

My love will be to Fair Mary
Faithful, lasting forever
We will sing to our friends and loved ones,
And I am going to her wedding

For details on the story behind the original song, which was in Gaelic

Gaol Mo Chìdh'-sa Màiri Bhàn