This text comes from The Scottish Minstrel (Second Series), a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
First when Maggy was my care,
Heaven I thought was in her air,
Now we're married, speer nae mair,
But whistle o'er the lave o't.
Meg was meek and Meg was mild,
Sweet and harmless as a child,
Wiser men than me's beguil'd;
Sae whistle o'er the lave o't.
How we live, my Meg and me,
How we love, and how we gree,
I carena by how few may see;
Sae whistle o'er the lave o't.
Wha I wish were maggots' meat,
Dish'd up in her winding-sheet,
I could write—but Meg wad see't,
Sae whistle o'er the lave o't.