Dancing with the Stars finalist William Waiirua pokes fun at winner Manu Vatuvei

Social media star William Waiirua has poked fun at fellow Dancing with the Stars contestant Manu Vatuvei in an "open and transparent" throwback Thursday video.

Waiirua posted a video on Facebook on Thursday revealing the "injury cloud" that Vatuvei was under in the lead up to the Dancing with the Stars final.

"Not a lot of you will know that Manu was under a massive injury cloud, and by injury cloud I mean like he had a real bad case of the diarrhoea and hemorrhoids also," Waiirua, who came fourth on the show, said.

Vatuvei, the former Warriors player who won the competition, can be seen cracking up in the background of Waiirua's video.

Waiirua also caught the case of the giggles as he tried to explain how he got through his "injury".

"For him to get through that, he was shitting his pants his whole time. Man we had to get the adult nappies."

He ended the video on a positive note, congratulating his friend on overcoming adversity. It's been viewed more than 5000 times since being uploaded late on Thursday.

The Dancing with the Stars final was earlier this month, with Vatuvei winning and comedian Laura Daniel coming in second. 

Vatuvei was repeatedly praised for showing his emotions and vulnerability during the show.

He even choreographed his final showdance himself, which earned his first perfect 30 score in the competition.