A group of three or more Holsteins dat you wanna know if I've ever been verbally told about.
You: I saw a herd of cows today.
Me: You saw a what?!
You: HERD --- herd of cows.
Me: Of COURSE I've heard of cows --- I wasn't born in a cave or backwoods cabin, y'know!
Used to describe someone who’s completely in a ridiculous or unlikely place, or busy doing something absurd. A bovine version of “up a hog’s ass for a ham sandwich".