Gallaghalism is a religion based on listening, accepting and agreeing to disagree.
Since I'm a part of Gallaghalism I have to hear you out before I tell you that I don't agree with your views.
by mswestergard September 20, 2013
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1. extremely nice guy; sensitive

2. horndog; eager for sexual intercourse

3. amazing in bed; hot

4. extremely hilarious; will make anyone laugh
That really nice horndog is a gallagher.
by gallagher14 February 20, 2009
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After ejaculating on a girls buttocks, the man takes his penis, and much like a hammer to a watermelon, uses the head of his penis to splatter his own pool of semen all over her.
Getting inspiration from the prop comic, Ted decided to give his girlfriend a gallagher, unknowingly hitting her cat who was in the splash zone.
by ComediaAGoGo August 3, 2010
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(n.) a person or thing that acts in a manner such as imposing odd characteristics. Not normal.
"gallagher" a person saying odd comments like gub gub incessantly
by Dr. Jason Smith Ph.D UAP February 22, 2011
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Its a sex move. When the guy is about to ejaculate, he pulls out his dick, lays it on top of the chicks stomach, and punches down on his dick like a hammer when he is busting.

Seed is spread all over the place, just not watermelon seed.
"Dude, she is totally easy, you could for sure give her The Gallagher tonight!"
by CaliBoy Twizzler October 25, 2009
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