Reference to Disney's Cinderella, this verb refers to the particular scene when Gus is carrying too many things at one time, and even uses his chin and teeth to help him carry such a large amount of things at once. This can be used to carry more things than normally plausible in hopes of making fewer trips than otherwise.
"I had too many books to carry this morning so I had to gusgus it. I looked like a fool though."
"Can you help me gusgus these boxes to the storage room?"