Captain Beefheart Harry Irene lyrics

Harry Irene were a couple that lived in the green
Harry Irene were a couple that ran a canteen
Ran a canteen
Ran a canteen
Two people Harry and Irene like you never seen
The floor was made of oak, the door was smokey gray
Their tuna sandwiches would turn the dark into day
Harry Irene were a couple that ran a canteen
Harry Irene were a couple that lived in the green
Ran a canteen
Ran a canteen took Harry for all of his green and Irene
Harry was left holding an empty canteen
What does this mean?
What does this mean?
What's the meaning of this?
Poor Harry, I guiss