I heard it as: "Montana, where men are men and sheep are nervous."

bumper sticker spotted in the San Francisco bay area back in 1968: "Hippies are living proof that Cowboys Screw Sheep"

and my favorite song in this vein:

"I Like A Moose"

and this from a stand-up comedian in a Wells Street (Chicago) bistro back in the early 60's:

"My brother studied Animal Husbandry at the University of Wisconsin...
















until they caught him at it."

CB