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The name of your pecker when you're slamming your junk into a girl's chest like a meaty idiot.
My Gallagher's Hammer was going full speed when I tried to make out with my crush in the hallway.
He was using his Gallagher's Hammer like it was a jackhammer on a construction site.
I called my Gallagher's Hammer 'The Beast' because it was wild and loud.