while fucking a girl from behind, perform a double fisted smash into the small of her back.
"I gave Leah the ol' Irish Hammer last night, and that bitch went nuts!"
by SexionVIII November 1, 2006
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A very large penis which the girls know by,"Keegans Irish Hammer"
"Yo, did you hear about Keegans Irish Hammer.I heard its so big it can hammer a spike into a board!"
by Keeganshammer August 29, 2008
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An irish war hammer is a worded used to describe an Irish mans tool that he brings to battle.

Woman:"so honey what tool did you bring tonight?"
Man:" Well,in that case i guess Ill whip out the ol' Irish War Hammer and slap you with it!"
by The Irish Hammer January 12, 2007
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