LSD reference from Alice in Wonderland.

An extremely ugly person, usually of Middle Eastern descent, with a large nose who is totally mad and likely to blow your ass up with some jihad shit.

Someone with great skills in a craft in which they specify. Many times used as a sports team name because of the definition. The image of the mad hatter team symbol usually shows a large, angry, and muscular man resembling 'Uncle Sam' the mascot of America.

A poorly performed handjob. Usually by a girl who says she is experienced. Yet, in actuality, she jerks you off like a crazed sea dragon.

When you take a hit off a pipe/bong/blunt with marijuana in it and in the same breath inhale from a cigarette and then without exhaling take a shot of hard liquor then exhale all the smoke after swallowing.

The Tea Party movement. Specifically the more radical ones that think there is a communist plot and a threat to the democracy to the country. They wear weird hats. They have insane conspiracy theories. They are loud, provocative, and in coherent... like the Mad Hatter in Alice in Wonderland.

A sex game that is played with two or more people. The rules are simple, while in the middle of a sex act one person, who will play the part of the mad hatter, yells "Change places!" Everyone then must rush to switch positions and or partners. The same position cannot be used twice with the same partner. This is a reference to the tea party scene in the Alice in Wonderland book.

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"

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"