The act of giving a hand job in which the tip of the penis is pointed directly into the palm of the female's hand. Then, in claw-like fashion, the young maiden uses her fingers (with the palm still firmly attached to the head) to massage the shaft to the point of climax.
Steve: "So how's Donna with her hands?"

Charlie: "Well...at first I thought she didn't know what she was doing, but then I realized she was tryin' to give me the ol' Mad Hatter and I relaxed."
by CMWin October 4, 2009
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A day of madness. Ever watch Alice in Wonderland? Well ayyyeeee that's what this day is. Yep, it's real. Google it. Grab a crazy ass hat 'cause this is gonna be mad.
Person1: What's with the hat??

Person2: MAD HATTERS DAY

Person1: The shit when did this exist
by RVPQueen March 17, 2016
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Old definition: madness induced by mercury fumes generated in factories that used this metal in hat fabrication.

Millenial definition: condition experienced by ambitious women who have to assume many roles in order to maintain diplomacy and harmony in a male dominated world.

The field of dentistry has confirmed the validity of this new definition by claiming that introduction of composite materials to replace amalgam restorations have shown no quantifiable impact on the behaviors of driven female practitioners.
My girlfriend has a mad hatter disease, Friday is always her second favorite F* word.
by Goldstar July 11, 2015
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A fine cocktail made with equal parts of beer gin and absinthe
Dude! I got TRASHED yesterday with your swiss mad hatter
by TheGarzo January 29, 2022
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The act of cumming on your partner’s hair and immediately placing a hat on afterwards. Thus, making them a mad hatter from the amount of time it will take to completely remove your baby sauce.

Invented in Danbury Connecticut; home of the Mad Hatters
“Did you hear Conway gave Cathy a mad hatter. There was so much cum it glued the hat right onto her head”
by Mike Honcho playgirl star November 21, 2019
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A deeply annoying person who you just wish would leave you alone.
"Connie, Megan and Aimee are a bunch of mad hatters" Chef Adrian
by wolfburp November 15, 2016
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Mad Ass-Hatter is that one guy /girl who is absolutely batshit crazy and also an asshat/jackass.
Usually reserved for exes, enemies, or frenemies.

Can be used as an action word as well to describe weird situations/drama.
Example 1:

Person A: Dude, Jack is such a mad ass-hatter.
Person B: I know right? Can’t believe I dated that fucking psychopath.

Example 2:

Person A: Yo, did you just see what she did to George?
Person B: Yeah, that was some weird mad ass-hattery, my guy.
by BADDYBIDDY February 24, 2019
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