I always heard it a “merry”, and took it to mean he could see the squirrels outside frolicking and having fun, while he was stuck in a boring office all day.
On the “merry” vs “married” question: Milton
The subtitles a few different places on Youtube say, “married”, but with Milton’s voice and auto-generated subs being what they are, I wouldn’t use that in a court of law.
And the deleted scenes.
the subtitles on the DVD release say “married.”