As in "To Be Determined". The excess fat, chunkyness, fluffyness, or plumpness on a person's body. Typically located in the midsection area of the human body blocking the abs.
Matt: Dude, you really need to start exercising.
Ricky: Yeah, I guess it's time to start figuring out what I'm gonna do with all this TBD muscle.
by Breaston December 14, 2009
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A penis incapable of achieving erection due to the over consumption of alcohol and/or meat (ribs).
"Hey dude did you score with Sally last night?"
"Nah bro, I got the butter muscle"
by KCMOMAN April 24, 2012
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English Teacher: "This is the third time you haven't done your homework, Kyle."

Kyle: "I had chores to do on myself afterschool, teach!"

E T: "Oh, please, you're a turd muscle. That's why you didn't do your homework!"
by NateBlake666 June 6, 2014
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When u neck is so big that u can breath more then average human being
Navel got a muscle neck
by Yet squad boy February 12, 2016
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The one and only "Legendary Luv Muscle" "Big Jim Reaper" "Kentucky King of Kickass" "the Deity of Doin It" "the Hardcore Hillbilly Heartthrob",the real reason Luv Muscle means anything in today's society,this man is the reason for the big dick myths and legends associated with Russell or Luv Muscle,the sexiest critter to ever crawl out the Appalachian mountains,lover, fighter, friend,father,an forever a Legendary HOTTIE!!!!!
Is that Russell "the Luv Muscle" Lemaster quick get a pic with me a d him together .
by BigJimReaper February 24, 2023
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A boy who's only personality is his muscles.
girl 1- "I got a new boyfriend!"
girl 2- "What's he like?"
girl 1- "uh..."
girl 2- "he's a muscle boy"
by Griffin Stein November 21, 2022
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A way of describing a person who acts in such a way of inconsistencies compared to others.
Boy oh boy, Billy is acting like a dink muscle today. Look at him barge through the line to load up on seconds.
by GMA-4-Me December 28, 2018
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