Dr. Owen Pugh defines the word as what is squabby, bulky.
"Welsh Folk-Lore a Collection of the Folk-Tales and Legends of North Wales" by Elias Owen
The dodo was a squabby, ugly, dumpy, not to say fat-headed, bird when it lived; now it is a hero of romance.
"The Strand Magazine, Volume V, Issue 26, February 1893" by Various
The Empire brought in squat and squabby shapes, comfortable enough no doubt, but entirely destitute of inspiration.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7" by Various
Write and tell me something about my poor Squabby.
"Louisa May Alcott" by Louisa May Alcott