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The action of fingering a girl and after the first few minuets the man decides to stick his entire arm up the womans vagina While yeling "ARMAGEDON" in a hill billy voice... sometimes resulting in etreme euphoria or death.
Brian and Maher were fingering their mom and gave her an Arm-a-gettin. Now they invited us to her funeral.

Yo this kid from fox lane gave me an arm-a-gettin it was wonderfull!
by Skanky Ass Byram Hills Girl March 16, 2007
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