The act of doing something before any other participants are ready, whether one is entering an establishment, conquering a task, or penetrating another person. In the latter case, the other person is a willing participant, but was not anticipating the act of intercourse beginning so suddenly.
"Gwahhuhuuh? Dammit, Bill! You can't just up and Leeroy Jenkins your way into my snatch before wetting my whistle! Christ."
by Ameri-can-you-not? January 24, 2017
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This is a sexual maneuver involving feces, proper planning, and the element of surprise. Below is the full description of how to perform a Lukewarm Leeroy.

1. Prior to intercourse, one sex partner must defecate onto a plate without the other sex partner's knowledge. Keeping the plate of feces secret is key.

2. Once the defecating sex partner completes his bowel movement, the fecal plate should be hidden and kept secret from the other sex partner until just the right moment.

3. With the plate of dung hidden, the sexual partners should proceed to have a nice session of lovemaking.

4. At the height of mutual climax, the preparer of the plate of defecation should immediately and quickly run to grab the hidden plate of excrement.

5. With the tainted flatware in hand, the fecal bearing sex partner should run frantically screaming towards the unsuspecting sex partner and violently
throw the plate of crap at the person's chest.

Note: It is common to scream "Leeroy Jenkins!!!!" before throwing the plate of defecation at the utterly shocked sex partner. This phenomenon along with the close relation to the sexual move the "Hot Carl" is where the name Lukewarm Leeroy was derived (the dung is no longer "hot" since it was sitting on a plate, hence the term "lukewarm").
I gave my ex-girlfriend a Lukewarm Leeroy and now she is in a mental institution. She still hasn't recovered from the shock of me running at her full speed with a plate full of crap while screaming "Leeroy Jenkins" and then throwing it at her chest with all my might right after we had sex.
by Reynold Tucan May 9, 2008
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1. The famous World of Warcraft player and Chicken Lover, known for his stupid act of running into a field of enemies before his team was ready. I guess he was too excited for his paladin shoulders or whatever he needed from that trip (I don't play WoW.)

2. My Xbox Live name (LeeroyJenkinz13) that all my friends make fun of me for, but everyone else loves it....
1. "Let's do this, LEEEEEERRROOYY nJJEENNNKKKIIIINNSS"
"God damnit Leeroy!!"
"Shit, well I'm dead. Are we all dead?...hhmmmm...Nice goin' Leeroy!"
"Leeroy you SUCK!"
"It's not my fault! It's not my fault..."

2. "...Ya well at least my Live name isn't Leeroy Jenkins..."
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Term used to voice or show displeasure at the actions of an over-enthusiastic companion that proceeds ahead into the mission without regard for fellow team-mates, almost every time ruining the action or locking the other players out of the scene until reset or the character dies & re-spawns. References the over-enthusiastic meme/battlecry "Leeroy Jenkins!"
Leader: "Ok, we're set to do this, now before we go in--
player: *runs in ahead of all others, attack enemy & gets killed. others wait until player re-spawns*
Leader: "*sigh* Thanks, Leeroy."
by The Horn'd One September 29, 2017
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A phrase uttered in frustration when someone does something completely and utterly retarded
Jamaal: Godammit Leeroy!

Forekin: Godammitt...

Abduhl: Leeroy, you moron!
by ccccccccccccccccccccccc May 15, 2012
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To do something to intentionally piss one or more people off, for your own amusement.

Ex: Leeroy Jenkins, duh.

You can also use Leeroy for short.
Guy 1: "So yeah, I pissed a bunch of people off when I lit some A&F and Hollister clothes on fire, only to make a statement."
Guy 2: "I think they got the idea, Mr. Leeroy Jenkins."

Guy 1: " Dude, watch this shit."
*Goes and does some shit to piss everyone off*
Guy 2: "What a retard."
Guy 3: "He's not a retard, he's.."
Guy 1: "LEEROOOOOOOOOOOOOOOOOOOY JENKINS!!"
Guy 2: "Goddamnit, Leeroy."
by David777 August 25, 2008
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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
Some uses of Going full Leeroy/Went full leeroy

"My car went full leeroy and now I dont have an engine."

"My computer didn't have the minimum power required, so my power supply died when my graphics card went full leeroy"

"I am about to go full leeroy if this light doesn't change to green."

"James decided to go full leeroy, now we are in jail; bail us out?"

"My Prius is going full leeroy, I cant stawp it!!1!"

"My cat is going full leeroy, he broke some shit now; can I call you back?"

"Nick went full leeroy thinking he could take him, now he is in the hospital."

"Here, hold my beer; I am going full leeroy."
by Pen2_the_penguin October 19, 2012
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