Gachimuchi is the name given to the sub-culture of adult movies that involve muscular males wrestling in a homoerotic pornographic manner.

On September 30th, 2007, a portion of a video titled "Professional-Pants Wrestling", originally named "Workout Muscular Men 3", was uploaded on the Japanese video-sharing website Nico Nico Douga. This clip and many others got very popular on the site, gaining various remixes and edited-videos that use those clips.

The most notable clip involves Gay Porn Actor Van Darkholme, dressed as a Leather Fetishist, entering a locker room. Fellow erotic actor Mark Wolff, who is already in the Locker Room, has the following exchange with him:
Mark Wolff: "Hey buddy, I think you've got the wrong door, the leather club's two blocks down."
Van Darkholme: "Fuck You!"
Mark Wolff: "Oh, fuck you leather man. Maybe you and I should settle it right here on the ring if you think you're so tough."
Van Darkholme: "Oh yeah? I'll kick your ass!"
Mark Wolff: "Ha! Yeah right man. Let's go! Why don't you get out of that leather stuff? I'll strip down out of this and we'll settle it right here in the ring. What do you say?"
Van Darkholme: "Yeah, no problem buddy!"