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a friend of the dream team, and server operator on the dreamsmp he doesnt speak or show his face online, but is considered one of the funniest people on the dream smp just by using in game chat

his minecraft skin is captain america in a reindeer onesie
dsmp fan 1: did you see what Callahan just said

dsmp fan 2: yeah, he is so funny and he doesnt even talk!
via giphy
by dreamsmpfacts January 25, 2021
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In Ultimate Frisbee, you catch a disc thrown by your opponent in your endzone and score a point. It is the coolest thing in Frisbee.
OH MY GOD, KIP JUST CAUGHT A CALLAHAN!
by hotdish March 27, 2009
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Person1: hey you know Callahan?

Person2:no?
Person1: he was on George's stream

I'm stupid
by Hi I'm a dream fan June 26, 2020
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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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Using ones left hand to flitter and twiddle the external genitalia, or snatch of a clueless female who is trying unsuccessfully to be humorous or witty.

At the recent Texas vs. Nebraska college football game, a female Nebraska fan (Who thought she was being quite funny.) was seen wearing a shirt with the slogan: Callahan This. The shirt also had a large arrow pointing down to the minge.
β€œShe thought she was being hilarious, so I Callahaned her.”

β€œWhen my girlfriend tells a bad joke, I laugh sarcastically really loud and then Callahan her cooter.”
by George Henry October 28, 2007
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6
The T-shirt a pretty girl's wearing on an advertising picture of the same brand name, currently on the right of your screen (doesn't work all the time).
Jon : Hey dude, look on the right of your screen !
Doe : Oh an advertisement for Callahan !
Jon : You got it.
by SureIloveyoudarling August 16, 2009
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