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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.
by odan August 08, 2012
 
1.
Japanese BL term for really buff gay men like Billy Herrington.
Billy Herrington's (Aniki) pornos are the epitome of gachimuchi wrestling.
by BillyHerrington May 02, 2010
 
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?"
by Videodrome July 30, 2009