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1.
Japanese BL term for really buff gay men like Billy Herrington.
Billy Herrington's (Aniki) pornos are the epitome of gachimuchi wrestling.
de BillyHerrington 2 mai 2010
 
2.
ガチムチ/がちむち. A Japanese term that literally means "muscular chubby," which refers to big, bulky body types that are very muscular, but also have a good amount of fat.
Jiraiya, Go Fujimoto, and Ebisubashi Seizoh are just a few of the many bara manga artists who specialize in gachimuchi characters.

Many offseason bodybuilders tend to have gachimuchi body types.
de odan 8 août 2012
 
3.
A synonym for bara; a form of yaoi that appeals to an actual gay male audience, unlike the mainstream that usually appeals to women. Also can describe a man who is muscular, hairy, and carries a few excess pounds.
"Wow, guys fuck like manly bears in Gachi Muchi, wouldn't you say?"
de Videodrome 30 juillet 2009