1) A term commonly used by players of games like Call of Duty or Grand Theft Auto to insult players of the F2P Team Fortress 2. It mocks how much of the game and it's economy revolves around hats, and how almost everyone who plays it wastes money and time bartering for the rarest hats. They would use it to insult players of TF2, because TF2 is widely regarded by players of other, more mature FPSs to be "immature" and "all jokes and references". This is because a lot of the game is exactly that: Puns, jokes, and references to other games made by Steam. This would make it seems ridiculous in comparison to other games with more of a story line, and would make anyone who plays it seem like someone with "no taste in games"

2) Another term used by players of the game to describe other players that have a plentiful supply of hats, and many that are rare. This, in contrary to the other definition, would be used as a compliment by those who only have the Gibson to honor those that have everything from the store-bought "Modest Pile of Hat" to the envious "Pyrovision Goggles"
1) Andy: "Hey, you see that Adam guy over there? He's a Mad Hatter."

Drew: "What's that supposed to mean?"

Andy: "It means someone plays that one game, Play Fortress 3 or whatever. You know, the one with jokes and hats?"

Drew: "Oh yeah, that stupid game. I'd rather stick to GTA V, man! #YOLOSWAG360NOSCOPE420BLAZEIT man!"

2) MustacheManC2DaK: Hey, look at that ArisenJesus guy! He's a Mad Hatter! He could trade away fifty Pyrovision goggles and still have too many!"

HyperactiveNOtato: Really? I wonder if he'd give me a Anger...

MustacheManC2DaK: It's not happening man, give up on the dream!

HyperactiveNOtatoL Ok...
by HyperactivePotato March 27, 2014
Get the Mad Hatter mug.
Woman over the age of 50 who is determined to be happy and doesn't give a rat's ass what anyone else thinks.
Old Lady Richards tore up our garden because she doesn't like bees ... she's such a red hatter.
by ringlass February 1, 2005
Get the red hatter mug.
When you have to use your hat to wipe your ass after shitting in the woods or side of road.
As Gill finished his shit, he screamed from the bushes, it's a three hatter.
by MATTSLAPPY17 September 7, 2017
Get the Three Hatter mug.
That cocky son of a bitch that thought he was better then everyone else in the room. AKA, prom king, football team captain, baseball captain, etc....
by Huffy June 18, 2004
Get the White Hatter mug.
This goes back to the time when the people in the hat industry wound up with mercury poisoning due to the process of manufacturing the felt for hats.
He is as mad as a hatter,
by WDD2 April 28, 2016
Get the as mad as a hatter mug.
The act of defecating on your partners head whilst they are sleeping. Upon waking, the person will notice the steaming turd and immediately become mad - hence the term "Mad Hatter"
Sharlene really annoyed me by not giving me head last night, so I dropped a Mad Hatter on her! Looks like I wont get head tonight either !
by The St Albanz Hatter January 3, 2010
Get the Mad Hatter mug.