1. A term used to describe a situation in which another has done something malicious to you
2. When the term 'breaking my balls' just doesn't suffice

Referring to the 1980's comedian who became well known for smashing watermelons with a large mallet on stage.

See gallagher
John : Hows the divorce goin'?
Matt : She got the house and my car. Just a gallagher to the balls.

Priest : DI me bro
Paly: I'm out of reagents
Priest : Gallagherin' my balls
by Riggzzz December 2, 2009
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