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When someone or something randomly or is about to randomly and unknowingly put full effort, power, ability, etc. into something or somewhere when everything and/or everyone else isnt prepared, ready or unwilling to commit. Based off the popularized WoW video where a WoW player named Leroy Jenkins charged into a dungon without letting or hearing out the group's plans of attack, instead charged in and shouted on voIP "LEEEEERRRROY nnnnnJJJJEEEEEENKINNSSSSSS" The whole group went after his surprise attack, ending up in total devastation as the entire group was overwhelmed from aggro'ed monsters and being totally wiped out. Look up Leroy Jenkins
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