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2.
The state of being the best "bro" in a group of Broskis.
"Neuwkhhh, John is That Dude.
by OhYouKnowIFuxWithThatHollering February 26, 2009
 
1.
The person that everyone is trying to be like or looking up to. He influences the crowd and girls love him.
Person 1: How do you know she's gonna fall for you?

Person 2: Because I'm that dude.
by Dougie R January 08, 2006
 
3.
an attempt to concisely pigeonhole a person based on their peculiar behavior at the present moment.(practical use)- to make him/her critically aware of their current behavior
1. your friend arrives at the bar, sits next to you, and says, "Remember in third grade when you asked Stacy out and..."
annoyed friend interrupts, "Dude, you're being that dude."

2. guy on the other side of the room screams, "F--- YEAHHHH!!!" when Dave Matthews comes on the speakers.

girl says to her friend, "Wow, He's that dude."

by Sir Wisdom of Yorkshire August 21, 2008
 
4.
(Noun)

A code-word used to inconspicuously ask about marijuana.
1. "hey man, are you with that dude?"
2. "wheres that dude at tonight?"
by winwood November 03, 2005