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1.
(1) The act of hitting somebody in the groin region.
(2) A word said during the act of hitting somebody in the groin
when standing in a group, one person "kojimas" another person, and in the process of which yells "Kojima!!!" so that everybody can hear and laugh
by TheSearch October 31, 2005
 
2.
1) To grasp one by the balls and squeeze.

A frequent occurrence in Metal Gear Solid Games, directed by Hideo Kojima
While doing a pat-down in MGS4, you can Kojima a person and knock them out!
by m^3 July 27, 2008