A dairy farmer proposed to his girlfriend by sliding a diamond ring onto a cow’s teat — and critics say the engagement photo is “udderly” creepy.

The unnamed Singaporean couple shared the shot on Facebook, where it was picked up by a group called “That’s it I’m Ring Shaming,” which mocks braggy and tacky question-poppers.

“Shaming the ring and the whole photoshoot,” one observer bashed. “The person is a farmer. Still doesn’t excuse his bad taste. And is this considered a nipple ring?”

Others slammed the romance-challenged moo-ve as “gross” — and even wondered if the heifer rocking the rock was ok.

“He’s really trying to milk the proposal,” another person quipped.

Another chided the soon-to-be bride, saying, “Oh my god. How big is your finger that you can fit your ring on a teat?”