2 definitions by JackJackAttack

1. someone that's fluffy and appropriately nicknamed Marshmallow
2. someone who pulls a total douchebag move
3. someone with a huge ego, even though in reality, they are quite lame
1. "whoa someone's looking marshally today"
2. "wow, can you believe Jake pulled a marshall on Sharon. So not cool....."
3. Marshall "i worked out for five hours today; you could wash clothes on these abs."
Everyone else "ummmm no."
by JackJackAttack July 29, 2011
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(n)A person who makes a fun occasion awkward or otherwise boring by being the one guy to disagree with the majority; a person made into an outsider by his ridiculous antics.
(v) being That Guy on any occasion; Being made into an outsider by your ridiculous antics.
"dude look at Rick"
Rick-(proceeds to tell the girl he just met about the history of Judaism)
"Oh god he's become that guy"
"Should we leave him?"
"Yeah, he's already too far gone."

"Bob, you've been That Guying on several occasions for a while now, we all just want the old Bob back!"
Bob-"you guys just don't understand! I REALLY LIKE NINE INCH NAILS!"
Rest-"oh god he just That Guyed so hard it gave me ASL"
by JackJackAttack September 21, 2014
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