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Basically the opposite of a chimo. A teenager or someone in their early twenties that can not get enough of middle-aged or older men.
Cassandra: Dude, Shane is sooo hot. With a million o's.

Amber: Dude, he's like 34...

Cassandra: Do you think I care?

Amber: Dude, you're the biggest oldmo I know.
oldmo by Cassandra Q February 26, 2010
Related Words

oldsmobile 

Big Suzy had a brown Oldsmobile Delta 88 that had previously belonged to an insurance agent.
oldsmobile by move zig September 30, 2003

Gary Oldman 

1) An actor whose talent, popularity and value is undermined by the society. See also underrated
2) A satire to award centers like The Academy Awards (Oscars) or Golden Globes, along with actors like Joaquin Phoenix, Brad Pitt, Edward Norton, Johnny Depp, Tom Cruise, Glenn Close...
Sad fact: Gary Oldman has only one oscar nominations and no golden globe nominations at all.

Rational guy: "Why would Gary Oldman want an oscar? I tdon't think he has time for this Mickey Mouse Bull Shit."
Gary Oldman by kdrng June 7, 2016

Oldsmobile 

Retired brand of cars overseen by GM. Also one of the oldest car companies in history. Pioneered front wheel drive in a world of rear wheel drive. The company collapsed due to sales which did not satisfy GM even after Oldsmobile completely remodeled itself with a fleet of more attractive cars from 1997 to 2004. To many, the closure was a shame because Oldsmobile created some of the most attractive badge cars in GM's line up. Examples include the Oldsmobile Intrigue and Alero which are considered in most cases to be more appealing than Pontiacs Grand Prix and Grand Am. The companies reputation and marketing did not hold up in the 21st Century and despite their quality vehicles, the GM divison, Oldsmobile, was discontinued.
My Great Grandfather drove an Oldsmobile.
My Grandfather drives an Oldsmobile.
My Father drives an Oldsmobile.
I drive an Oldsmobile.
My children will not drive Oldsmobiles.
Oldsmobile by Ohio05 July 2, 2005

oldmaning 

when an old man texts an old man simultaneously while eating a can of spaghetti and looking at pictures of a daisy duck.
stop oldmaning

oldcootism 

A noun used to denote speech such as "dagnabbit," "gosh dern," and "whippersnapper" stereotypically associated with cantankerous old men.
The cantankerous septuagenarian used the oldcootism of "You young whippersnapper" to address a neighborhood kid who had ventured onto his lawn.
oldcootism by maximo hudson December 13, 2010