A guy who is seen wearing hats and never spotted without one, to the point where you're not really sure what the rest of the guy's head would look like in the absence of a hat.
Turtle on Entourage is pretty much a hat guy.
by cunnilingus linguist September 25, 2008
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a reoccurring character in the web comic xkcd. a self described classhole with an outstanding arrest record. always seen in a black top hat.
person 1: i poked holes in your ramen noodles and condoms.

person 2: Dude, stop fucking pretending to be hat guy!!! You are not a fucking Stick Figure.
by IIAOPSW November 2, 2008
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Among the usually loud, outspoken, boisterous, and hardcore fans that attended the now defunct Extreme Championship Wrestling (ECW) federation, stood a middle-to-late-aged man at the front row, "The Hat Guy", who was well-known just for being an even louder, even more outspoken and more boisterous fan than any of his peers. When everyone else was sitting down, he would randomly stand up (on average 30 times during the entire show, (if not more) and bark things at the wrestlers, referees, women, and just about anybody who walked into the wrestling ring.

It seemed like he showed up at nearly every single ECW event.

And since no one knew his name, they identify him as "The Hat Guy"
Wrestling Fan #2: Who's that guy screaming in the front row?
Wrestling Fan #1: Oh that's the hat guy.
Wrestlign Fan#2: What's his name?
Wrestling Fan#1: No one knows. He's just 'the hat guy'.
Wrestling Fan #2: He part of the show?
Wrestling Fan #1: Although it seems like he is, he's not.
by CheyenneWyoming May 30, 2006
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A fat guy hat is your standard "go to hell" hat, but loses its hellish meaning when worn by morbidly obese individuals.
Fat Guy Hat
by WordUpyoyo January 12, 2013
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a guy who walks around school with a hat on and his head down. he thinks he’s in the flaxxies but he isn’t and also he is big botman
girl 1: look it’s hat guy
girl 2: oh yea he’s a fookin bot man
girl 1: he is not even in the flaxxies!!
girl 2: L
by robocopcarter September 8, 2020
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