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.
by hotdish March 27, 2009

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
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!
dsmp fan 2: yeah, he is so funny and he doesnt even talk!
by dreamsmpfacts January 25, 2021

When you screw over your soldiers or employees because you can't get over your own bitterness. Applies to all people who revel in ruining the lives of others because of their own whimsical opinions. Common symptoms of "A Callahan" include Napoleon Complex, little dick syndrome, and others.
"Dude, my boss won't let me take vacation for my honeymoon. He's pulling a Callahan on me."
"I literally had COVID but my professor won't let me make up the exam. What a Callahan."
"I literally had COVID but my professor won't let me make up the exam. What a Callahan."
by psyfloperator November 18, 2020

by Hi I'm a dream fan June 26, 2020

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.
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.
“She thought she was being hilarious, so I Callahaned her.”
“When my girlfriend tells a bad joke, I laugh sarcastically really loud and then Callahan her cooter.”
“When my girlfriend tells a bad joke, I laugh sarcastically really loud and then Callahan her cooter.”
by George Henry November 15, 2007

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.
Doe : Oh an advertisement for Callahan !
Jon : You got it.
by SureIloveyoudarling August 16, 2009

by ・Your local idiot・ November 19, 2021
