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1.
The act of multiple nut-shots stemming from one nut-shot while in a closed vacinity.
Guy 1: hit's Guy 2: Guy 2 hits Guy3. It's like a chain reaction of nut-shots until everyone is holding their privates and on the ground.

Kid who walks in: Woah! Looks like a kill circle went down in here.
by Circle_Killer123 April 20, 2011