Andrew Luck of the Indianapolis Colts. Source: AFP

But NFL star Andrew Luck is revolutionising the art with his bizarre take on talking trash.

The 25-year-old has already established himself as a superstar, taking the Indianapolis Colts to the playoffs in his first three seasons in the NFL.

Luck’s played in two Pro Bowls and thrown for more yards in his first three seasons than anyone in NFL history.

But it’s his sledging that has people talking.

“Among NFL players, the gossip around Luck concerns a peculiar brand of on-field chatter so confusing and brilliant that no one knows quite what to make of it,” writes The Wall Street Journal’s Kevin Clark.

Andrew Luck: Nice guy or evil genius? Source: AFP

Washington Redskins linebacker Ryan Kerrigan said: “In all the years I’ve played football I have never heard anything like it.

“Nothing even close.”

What makes Luck’s sledging so strange is he “sincerely and enthusiastically” congratulates opposing players when they hit him hard.

“Great job!” Luck will say, or “What a hit!”

“It is, players say, just about the weirdest thing any quarterback does in the NFL,” Clark writes.

Last month, New England Patriots pass rusher Rob Ninkovich said he was utterly confused after belting Luck and being immediately complimented by the quarterback.

Ninkovich responded with, “Thanks for ... uh ... accepting that hit?”

Luck compliments opposing players when they hammer him. Source: AFP

Philadelphia Eagles defensive back Nolan Carroll experienced a similar thing when he heard a “Great job, Nolan!” after hitting Luck.

“Then I realised it was Luck who said it. I’m like, ‘What’s going on? Aren’t you supposed to be mad?’” Carroll said.

“So then I’m the one who gets ticked off because an upbeat attitude isn’t something you see.”

“You know if you hear a quarterback get mad, you are in his head.

“With Luck, you thought you hurt the guy, you hear, ‘Good job,’ and you just say, ‘Aw, man.’”

According to The Journal, the most likely reason Luck does it because he is a really nice guy.

“Former Stanford teammates, for instance, say there’s likely an element of gamesmanship, but that’s secondary to his sincere respect for a good play — even one that resulted in him getting knocked off his feet,” Clark writes.

“This, players say, is Luck’s brilliance, even if it is unintentional.”

Click here for the full story from The Wall Street Journal.