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Scientists use this and mathematics whizzes too. It means Obvious To the Most Casual Observer. It's useful in lots of ways.
Why is that painted blue? Man, that should be OTMCO, ya know?

OTMCO by geoaz April 5, 2009
Urban Dictionary Merch
A word formed by combining "wordOtaku/word" and "Convention". Dr. Hal Emmerich, the engineer who was the team leader in the Metal Gear Rex project, uses this word as his nickname.
Call me Otacon.
otacon by FROGGER June 17, 2003
Related Words
A music genre made up of songs heavy origins or basis in fan communities, such as those for anime. A large portion of this genre is made up of J-Pop.
My buddy: “The hell is that”
Me: “Otacore. It’s basically anime music”
Otacore by moshpitfuneral December 6, 2019
Word of the Day on December 2, 2022
The partner of ex-US soldier Solid Snake in their international anti-terrorist activities. Otacon provides operational support, while Solid Snake physically executes the missions. Otacon's real name is Dr. Hall Emmerich. He first appeared in the video game Metal Gear Solid.
otacon by Nicolai July 2, 2004
combining the words "otaku" (as in someone who likes anime and sci-fi) and "convention" (as in a gathering of people under one base intrest... mostly nerds). the name of a conneticuit based sci-fi/anime/comic convention, that was used as the alias of Dr. Hal Emmerich in the metal gear solid series of games.

although otacon is an invaluable sidekick and amazing hacker for solid snake in MGS, he's a pants wetter and a bit of a crybaby.
guy 1: d00d LOLOMGWTF???!!!1111one! i'm lyk going 2 cosplay @ teh Otacon dis year LOLOMGWTF?!!!

me: really? i'm gonna sniff coke off the blade of a knife.
otacon by tofubot November 4, 2004

otcomplexia 

Mental-complex in which the afflicted finds a need to make up stories to impress people he/she does not know if online formus.
That guy is such a loser with the biggest otcomplexia complex. Check out his latest post:

So yeah rough week and i need to spend a week away from home, so i move my biz to a hotel a mile down the road, very decent hotel.

I go to take a shower, unwrap the soap, no problem, wash the cash and prizes and all that jazz, and then go for the little hotel shampoo/conditioner.

I notice that the seal didnt break when i twisted it, and that it was light, it wasnt full.

I fastly dump the remaining contents into my palm, and for the facking life of me.... i chit you not, the LAST thing that it was, was shampoo. something out of an American Pie scene or something, no fun finding shamspooge in your hotel.

discuss
otcomplexia by buriedinsounds August 3, 2006
A person that happens to be an otaku and have a love for tacos.
Ching: Are you an Otaku or an Otaco
Chong: Im and Otaco
Otaco by krayuk February 23, 2017
More from Urban Dictionary

You met me at a very Chinese time in my life

A moment in time where you feel distinctly Chinese over all other things.
Dante: "I wish I could be Nigerian, but I can't because I'm Chinese. You met me at a very Chinese time in my life."
Word of the Day on September 25, 2026
Adjective. Used to describe persons who have adjusted or altered their lifestyle for environmental reasons. Crunchy persons tend to be politically strongly left-leaning and may be additionally but not exclusively categorized as vegetarians, vegans, eco-tarians, conservationists, environmentalists, neo-hippies, tree huggers, nature enthusiasts, etc.

Also used to describe establishments where alternative foods and products are sold, i.e. natural food stores.

Modified derivative of granola.
"I need more crunchy guys in my life. I'm so tired of dating preppy metrosexual assholes."

"I'm heading out to the crunchy store to pick up some fair trade chocolate and tea tree oil, do you need anything?"
crunchy by EBC July 11, 2007
Word of the Day on September 24, 2026
A group of people, typically women, searching through someone’s digital footprint in order to find more information about that person.
Susie wasn’t sure if her new Hinge match was a creep, so she assembled Galantir and they found out he used to post slurs on gaming forums.
Galantir by Ge-sus September 22, 2026
Word of the Day on September 23, 2026

murderhobo 

In a tabletop game, a murderhobo is a player who murders NPCs indiscriminately. This is normally derogatory, referring to a player who totally ignores quests, dialog, backstory, trade, world building etc.

The term is most common with Dungeons and Dragons, but it can be applied to most RPGs where the player is allowed to kill most quest-giving NPCs and NPC traders. E.g. Elder Scrolls, Fallout, Divinity original sin.
DM: The sad little orphan girl tugs at Steve's trenchcoat to get his attention, and ask for help saving her pet dog from...
Steve: I'd like to roll a strength check against strangling the orphan.
Dave: I call dibs on the dog.
DM: You murderhobos disgust me.
murderhobo by Loup&S September 9, 2021
Word of the Day on September 22, 2026
In sales terms, a whale is a prospect that is significantly larger than an organization’s average customer.

Whales are large and extremely difficult to close. Due to their immense size, they are highly sought-after.

A whale is typically identified at first by a whale hunter on the sales team, but often requires cross-discipline participation in order to close; this includes assistance from operations, engineering, creative, client success, and business development teams.
"Shit...the sales director chewed me out on the sales call this morning. He's totally pissed that I have nothing in my pipeline. I've been focused on this one whale for so long that I haven't had time to prospect for normal-sized deals."
Whale by FQ_GFY February 3, 2020
Word of the Day on September 21, 2026

Concrete cowboy 

A guy who thinks he's a country kinda guy, but in reality lives a comfortable city / suburban life.
Eugene: Look at that dude in the cowboy hat!
Todd: He's just a concrete cowboy.
Word of the Day on September 20, 2026
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