A blargablarg is any device used to carry a child, or in some cases midget(s) or dwarf(s). These devices usually consist of a backpack like design in which the smaller person is inserted and carried upon the body of a larger person. These devices were originally developed by Native Americans to carry their papoose (Algonquian for "Child") leading many of the white-man to mistakenly refer to the carrier as a papoose.
That crying baby is annoying me so much I think I might tear the blargablarg right off the mother and smash it against a tree.
That lady with the blargablarg freaked me out, she turned around and I thought I was looking at Quato from Total Recall for a second!