People you come in contact with through forums, chat rooms, Facebook, and the like... who find satisfaction in arguing with you via their keyboard.

These are usually young adults who live in their mothers basement who could never be able to hurt you in real life, so they get out all their sexual/social/financial frustrations on the Interweb. Those with keyboard muscles usually have no job/hobby/significant other/family, therefore have all the time in the world to pick pointless fights with intelligent contributors to society.

They usually cannot spell to save their lives, and will try to insult you with everything they can think of. (which usually isn't anything that makes sense, AT ALL.)

The best way to deal with those morons with Keyboard muscles? Kill'em with kindness. It may sound sooo cliche, Just try it! It works everytime. You want to actually get to them? be the nicest you can be. ;) I'm pretty sure it overloads them blows their empty little heads up.

- We also see these types of muscles show on other things, like XboxLIVE- although known by other names. Please see: Xbox Live Dick
HaX0r.N3wB.pwner: lyk omg, u iz sucha fag bitch go die u stupit azz ho... u realy r dum u kno dat? I;ll slitt yur fekin throat n00b!!!!!1

Me: Wow, calm down honey. You are so right... I am such a noob. Can I feel your Keyboard Muscles? :)

HaX0r.N3wB.pwner: wtf r u tlkin about it doezt make sentss!!! I hatee u!!!!1
by ooh-La-Lauren December 1, 2010
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slang for a woman's vagina, usually one that is tight and wet.
I Love when My girl's puddle muscles contract when she starts to cum.
by getcombowned February 17, 2014
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Male (or female) body builder whose only concern in life is bigger muscles. Usually implies little-no brain activity.
John is a complete muscle head, nice to look at but nothing upstairs.
by Xavier2 January 16, 2007
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Perceived increase in confidence, machismo, bravado, strength, cage-fighting abilites (etc.) from a public chat room or IM user based PURELY upon the anonymity of the "tough talker" to the person they are "tough talking to".
A 6-foot, 130lb. dork threatening to "kick your ass" when you disagree with his opinion on the relevance of Linux, Firefox, Open Source, Dungeons and Dragons or whatever other lame activity the "net muscled" geek in interested in.

"The dork is using his Net Muscles to bully the chat room into agreeing with him."
by WebPhenom February 17, 2006
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A Canadian term meaning "Beer Belly"
Molson, of course, is a brand of beer commonly drank and celebrated in Canada.
Rob: Yo, did you see that guy at the bar? He was fat!
Bob: Nah, dude, that ain't fat. That's a Molson Muscle!
by molsonman September 20, 2007
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by Matt Pat December 31, 2005
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