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.

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.
- I can't believe he just tried to headbutt that dragon. What a Leeroy.

- We were doing great until that idiot totally Leeroyed us.

- The party was really boring until Bob pulled a Leeroy.
by Dreyfuss May 11, 2005
Started a online fad of epic proportions. Just when you thought Numa Numa Dance was big, a World of Warcraft guild makes a video *staged or not dosent matter* that made everyone laugh. The video has a group
raiding some place and the guild is planing raid this one room that gave them probs in the past. As the raid is about to start a player in the group by the name "Leeroy" jumps up says his name and causes tons of monsters to kill his group. After everyone is dead and everyone is pissed at Leeroy he respons with the epic words "Atlest I have chicken."

Leeroy Jinkins in doing so became a internet star, but at the cost of never being able to play as Jeeroy again, being people will flood him with PM's and mail.
Leeroy-"Alright chums lets do this!

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

*later on*

Some player-"Leeroy you're just stupid as hell..."

Leeroy-"Atlest I have chicken."
by Woogy June 2, 2005
Person 1: Fancy snorting this leeroy mate? Person 2: What's in it though? Person 1: md & ket. Person 2: Sure thing!
by splint0r January 3, 2011
origin: a long time ago (a couple years back), the most famous wow player leeroy jenkins went with a raid with a couple other people. he was away from his keyboard and was missing out on the battle plan. while they were discussing it leeroy jumped on his computer and said "lets do this" and yelled out "LEEEERRROOOOOY JEENNNNKIINNS" everyone was shocked when he ran through. in short he got his whole team killed.

1.to do something rash and extremely stupid usualy in a group.
2. to do something rash but brave.
1. that idiot went and got his whole team killed, i wish he hadn't leeroy'd it.
2. don't even think about leeroying this one!
3. i think i'm going to leeroy this and save the day.
by rayonako lvl 70 March 15, 2009
To cause a group wipe by abandoning the strategy and zerging into the next room, thereby aggroing everything.

Taken from the practices of Leeroy, former member of PALS FOR LIFE
Man we were in Chillwind Camp last night and our mage totally leeroyed us!
by PC Load Letter May 11, 2005
LeeRoy is an American commentary YouTuber. His channel was originally called LeeRoy Reacts until early January of 2019, when he rebranded and shortened the name to just “LeeRoy”
Did you see LeeRoy’s new vid!
by Michael.ChRistiAn July 11, 2019
Mamoth: shit dude look over there
Grotsnik: Damn i Just Leeroyed the Operation. RUN!!!!!!!!!!!
by Grotsnik December 11, 2006