Wild video shows a giant bodybuilder brawling with two other tourists outside a Thai bar — with one of them smacking into a parked truck while desperately trying to backpeddle away.

The huge muscleman, also believed to be a tourist, was filmed swinging wildly at the smaller men Thursday in Pattaya, a city dubbed “Sin City” because of its reputation for sex and crime.

The barefoot bodybuilder — showing off his physique in a skimpy T-shirt and shorts — flattened one of them, while the backpedalled into the parked vehicle nearby.

The tourists, believed to be British, clashed with the larger man after leaving a bar, according to local reports.

“Around two or three people tried to gang up on a tall, muscular foreigner who was with a Thai woman,” witness Kittirach Sangprasert, 32, told Viral Press.

“But, even though there were more of them, they couldn’t overpower him.”

The battered men, ages 25 to 30, were taken to a local hospital. One was left with a dislocated hip and facial cuts, while the other was knocked out cold.