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
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