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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
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Jul 26 Word of the Day
Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed
I got a call from X the other night. She had an extra ticket to a concert she bought for a friend, but they couldn’t make it so she called me to ask if I wanted to go because I am her Second String Friend.
by Deus-ex-machina August 26, 2020
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2
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
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Gachimuchi or Gachi is a large group of music/Video made with gay porn stars including, Van Dark Holm and Billy Herrington.
Boy 1: Hey man check out this Gachimuchi?
Boy 2: Sure.
Aftermath
Boy 1: How did you like it?
Boy 2: What is wrong with you? Do you enjoy this stuff?

Boy 1: Yeah the songs are not bad.
Boy 2: You fucking Gay?
by Ram Ranch Jotaro January 09, 2020
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