Actor Jason Momoa has apologised for a 2011 Comic-Con video in which he made jokes about raping "beautiful women" on popular fantasy drama TV series "Game of Thrones".

Momoa, who played the role of Khal Drogo in the show, said he made a "tasteless comment" and still feels sorry for saying that in front of a live audience, reports aceshowbiz.com.

"I awoke in Australia to the justified reactions by many people to a distasteful joke I made years ago in Hall H for which I am sorry. I am still severely disappointed in myself at the insensitivity of my remarks that day," Momoa posted on Instagram.

"I know my sincerest apology won't take away those hurtful words. Rape and sexual harassment can reach anyone and I have seen first hand its painful torment among members of my own family and friends. I made a truly tasteless comment. It is unacceptable and I sincerely apologize with a heavy heart for the words I said," he added.

Momoa's apology came after the video became viral on social media again and Twitter users began slamming the actor.

"But as far as sci-fi and fantasy, I love that genre because there are so many things you can do, like rip someone's tongue out of their throat and get away with it and rape beautiful women," Jason said at 2011 Comic-Con.

His remarks made the crowd laugh at that time, while fellow cast members, including Lena Headey and Kit Harington, covered their faces in assumed embarrassment.