Irish Jackhammer

When a man (or woman) inserts their fist into a woman's vagina or anus (also could be a male's anus) and proceeds to violently shake them, while still inside, potentially causing extreme vaginal or anal trauma and/or Downs' Syndrome.

Samantha: Did you hear about Jeni? I heard Alex gave her a gnarly Irish Jackhammer!

Ryan: No shit! What a fucking whore!

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