What a bunch of clean-and-jerks.

Muscle-bound meatheads at a Long Island gym grunt and drop weights so loudly that it’s killing business for two shop owners next door, according to a new lawsuit.

The barber and financial-services adviser claim they’ve asked the owners of CrossFit King of the Beach to quiet down or install soundproofing — but the gym managers told them they don’t give a squat.

A third man, who lives in a second-story apartment in the same Long Beach building as the gym, says he can’t get a minute’s peace without feeling the earth move or hearing caveman grunts, court documents say.

The suit was filed by financial-services guru Joseph Hamlet — whose business shares a wall with the gym — as well as Top Hat Barbershop owner Mishoir Murdakhayev and the gym’s neighbor, Robert Moore.

“It sounds like an earthquake!” growled a source familiar with the lawsuit. “They don’t have to drop the heavy weights like that — it’s just some macho guy thing.

“They’re obnoxious and pay no attention when people complain, and have no respect for the other merchants here. These guys have run roughshod over the whole block.”

The three filers all declined to comment.

Named in the lawsuit are CrossFit owner Michael Abgarian, the gym’s chiropractor, Sean Pastuch, and building owner Isabella Realty LLC.

Filed April 20, the suit accuses the gym owners and managers of creating a dangerous condition and creating a “private nuisance,’’ harming the plaintiffs’ businesses and property.

“The noise and vibrations caused by [CrossFit] have caused excessive, unreasonable and illegal vibrations and noise,” the court papers state.

The documents also claim “outrageous conduct causing emotional distress.’’

The gym owners, too, declined to comment.

All three filers want the gym to quit with the loud noises and are seeking unspecified punitive damages.

“The women’s classes aren’t that bad,” said the source.

“It’s the men. They’ve been asked not to drop the weights. And they have told people, ‘F–k you.’ ”

A nearby beauty-salon owner, who has not joined the suit, said the vibrations from the dropped weights are so serious that they collapsed a cement walkway in front of her shop several weeks ago.

“It’s bad, it’s disturbing, the whole building shakes — people have their hair done and they come here to relax, but they can’t with this noise,” said Rachel Mirakova, 40, of Rachel’s Beauty Shop.

The first time she heard the weightlifting classes last fall, Mirakova thought a nearby building had collapsed.

She complained to the gym owners about the noise and was told: “This is our place — we can do what we want,” she said.

She described classes in which her shocked customers have almost been run over by groups of muscle-bound freaks who have run down the street holding weights on their heads as part of their exercise.