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7.
(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
 
1.
Guy who bangs your girlfriend.
Dude, I saw your girlfriend with a Gallagher last night
by Spartan17 October 20, 2005
 
2.
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
 
3.
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 03, 2010
 
4.
Very large eyebrows, like Peter Gallagher.
Man! Look at the Gallaghers on that dude!
by tignor December 30, 2011
 
5.
Noun: A very large penis.
Man have you seen Tim's Gallagher.
by The7theleven December 22, 2011
 
6.
Gallagher; verb ; When your girlfriend is giving you head, suddenly grab the back of her skull and jam your dick down her throat.. This is usually used when she has been being a bitch or just needs to be put in her place.
My girlfriend was complaining how our relationship is all about me, so while she was blowing me, i gallaghered the bitch.
by makesgoodwordsman August 01, 2010