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to have a huge mole on your penis
Jon has a huge cahill, girls dont like it!
cahill by charlie roids November 9, 2012
A term used when someone tops another persons idea or story.
Brad just cahilled his story.
Cahill by Cahilled October 26, 2013
The name of a badass Irish carpenter
Man those Cahill’s are cool
Cahill by anonymous July 13, 2021
To have no idea what you are talking about
God, she's such a Cahill
Cahill by Rct0712 October 26, 2022

Cahill Pour  

An Irish drink pour where it is fill to the rim of a glass or close to it. It is also triple then the normal drink pour.
Hey Babe, I ask for a Cahill Pour this glass is half empty.
Cahill Pour by Matt Cahill February 21, 2009

cahill'ing 

When one player in a competitive game decides to help another player win, without providing any benefits to the player conducting the cahill'ing.

Often done in order to seek revenge against other players or be a tool.
Oh damn, Cam was totally going to win that game of Catan last night - until Chris decided to start cahill'ing the fuck out of him with stupid trades.
cahill'ing by ZacharyJay May 18, 2018