According to the Ubran Dictionary:

1. Leeroy
n.
1: One who does not grasp the concept of caution.
2: One whose success is based purely off relentless aggression and pure luck.
3: One who likes chicken.
4: One whose battle cry consists of their own name.

v.
1: To destroy all hopes of success.
2: To rush headlong into danger without regard to consequences.
3: To satisfy one's own desires at the expense of all around oneself.

Alright chums lets do this!
LEEEEEEEEEEEEEEEEROOOOOOOY JINNNKINS!!!"

Other player-"Oh my god he just ran in..."

Atlest I have chicken.

1. I know, it has been round for awhile. Just though it would be good to add in case anyone had not seen it.
2. I wasn't at the LAN party so I didn't know you had watched it.

Leeroy Jenkins was part of a Jeopardy clue.