The act of getting so wasted that one pukes in a random sink and cleans it out with their bare hands.
Dude, I day drank for seven hours and got kicked out of a party because I got so Callahaned.
by Blond Doctor March 4, 2011
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Typically a dude who is chill but overprotective. He will beat someone up over something small. He loves to chill with friends and play Xbox. He is a hypeman. When he gets mad he gets really mad. He is a crazy dude with a ability to never show emotion but he will show madness
“Yeah, a broke my nose cuz of Callahan.”

“Guys shut up it’s Callahan!”
by EveryGirlEver6969 November 15, 2018
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(noun) An event in ultimate frisbee in which a defender catches the disc in their own end-zone, thereby scoring an immediate point at the turnover.

(verb) The action of the defensive move in Ultimate Frisbee by which one catches the disc in their own end-zone, thereby scoring an immediate point at the turnover.
(noun) Wow, did you see how Seth caught that Callahan last point?
(verb) Wow, did you see how Seth Callahanned last point?
by Ultimate Weirdo February 21, 2020
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An elderly confused man, suffering from dementia. Reliving his glory days without realizing he is indeed much past his prime. Essentially any 80 year old who believes he is still capable of being a functioning member of society.
The orderlies at the Mohecan elderly home on fox news were quoted "These Callahans just don't realize how little they are capable of anymore. They're stuck in the past, believing they are still playing college football with their leather helmets."
by Goulet198 September 15, 2009
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The Callahan Theory is performed when a person completes all of his/her homework on the absolute last day of the semester. No homework is done through out the course until the last day. Then, he/she hands all of it in to the teacher all at once. To complete the theory, you must still achieve a 3.5 GPA.
Matt - "Hey Pat, have you done your homework tonight?"
Pat - "No, we're only two weeks into the course, I follow the Callahan Theory."
Matt - "What's that?"
Pat - "It's when I do all of my homework on the last day of the semester, and still get an A!"
by MickWhop July 22, 2012
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A mostly white hellhole in Northern Florida
It's crawling with racist and homophobic Republican hicks. Has a population of a little over 1,000, but has a fuckton of churches. Most boring place on earth. If you're a minority, old white people will give you looks of disgust and fear. Don't live here!
I almost got shot by a bible thumping hillbilly in Callahan Fl when he saw my Ridin' With Biden flag
by ericcman July 4, 2021
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Downingtown-East legend who was popular among large groups of juniors during spring of 2009. Mysterious facebook jokester (nobody truely knows who he is). Suspected to be on the Downingtown East baseball team. The legend of Joseph Callahan sparked many other fake facebooks such as Zach Peterson, Chad Williams, and David Harsky.
by Downingtown East9 January 13, 2010
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