John S. Farmer, Slang and its analogues past and present…
“ Gone Gander.—See Gone Coon. To see how the gander hops, verb. phr. (American.) —To watch events. A variant of To see how the cat jumps. 1847. Porter, Big Bear, p. 96. Seein’ how the gander hopped I jumped up and hollered, Git out, Tromp, you old raskel! What’s sauce for the goose is sauce for the gander, phr. (common) .—A plea for consistency. Gander-month, subs. (common) .—The month after confinement; when a certain license (or so it was held) is excusable in the male. Also Gander-moon, the husband at such a period being called a Gander-mooner. Cf., Buck-hutch and Goose-month. ”
