I like this answer to viii. from a rival quizzers' site. It starts from a maritime emergency (running out of food while at sea) but it's said by a Jimmy rather than a Jim.

From the poem "Little Billee", by WM Thackeray - http://www.bartleby.com/360/9/84.html -
"To gorging Jack says guzzling Jimmy, “We ’ve nothing left, us must eat we.”