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from the movie "That Thing You Do". An "oneder" is a person who thinks highly of themselves and is frustrated that a certin point is not understood whole in fact, everyone understands it and sees other elemnts far beyond it.

In the movie the douche bag singer thinks writing "wonders" as "oneders"is clever. Everyone gets the pun but also know that radio announcers will pronounce it "oh - nee - ders".
An "oneder" - a person who thinks you do not get their point when you actually do and also see more.
Calling an anti-vaxer stupid is not good way to convince them to get vaccinated. Don't be an oneder.
oneder by scowb January 30, 2022

onderstatement 

when you're so under something you're over it
in regards to the bigfoot from pizza hut, "big would be an onderstatement"
onderstatement by andrewtabs September 13, 2020

Onederland 

When dieters go from weighing two or three hundred pounds down to 199 or less, they have reached Onederland.
When Jared started his diet he weighed 220 pounds. After losing thirty pounds on Weight Watchers, he realized he had entered Onederland.
Onederland by lubridan May 14, 2010

onedirectionsexual 

when you are only attracted to harry, niall, louis, liam and zayn.
person 1: bro I don’t find anyone else attractive in this world except from those 4 British boys and 1 Irish.
Person 2: you mean the one direction members?
Person 1: yeah! I think I’m onedirectionsexual
onedirectionsexual by tpwk-1D December 29, 2020
To overtly use proper grammar, really long sentences, and pompishness in day to day life.
Brian: "Hey dude let's smoke a blunt"

Onder: "I do think that is such a terrible idea, and thus, we should not do such a thing. But should you wish to do so, you do understand that you would be breaking the law and have a chance of being imprisoned? I beseech you to not smoke such cannabis in my face"

Brian: "wtf dude why are you so onder?"

Onder: "I am deeply offended at your usage of such profane language. Please abstain from asking me with such brash and terrible manner."
Onder by 1010102 April 19, 2010

Onderdonk 

When you dress up like a historical figure and fuck someone in the ass.
Did you see my George Washington costume? I’m going to onderdonk the shit out of her tonight.
Onderdonk by migglez June 7, 2018