Canadians might generally be known for their polite manners, but those apparently didn’t travel with one curling competitor to Milan for the Winter Olympics … because he threw some NSFW language at an opponent.

Marc Kennedy — a four-time Olympian for The Great White North — got into a shouting match with Sweden’s Oskar Eriksson during a tense match Friday.

Eriksson claimed Kennedy — the athlete throwing the rock in curling — was touching it again after initially releasing it … a violation of the rules.

The Canadian flew into a rage when the Swede called his integrity into question … telling his opponent, “I haven’t done it once. You can f*** off.”

After Canada won the match 8-6, Kennedy told a reporter he blew up because he didn’t like “being accused of cheating after 25 years on tour and four Olympic Games. I told him where to stick it.”

Kennedy has won two Olympic medals, including gold in 2010. Eriksson is no rookie … he has four medals and won gold in 2022.

BTW … officials didn’t call a foul on Kennedy — but many online feel he may have double-touched the stone. Tell us what you think by voting above.