onste 

Your probably someone doing that tiktok trend on the FNF character lemon demon but define him as monster, but here’s a definition anyway,
A bisexual, demon out of hell sent to kill someone and trick or treat without the “or treat”

Your simply, onste!

onste by FNF-kid June 27, 2021

onste 

A demon from hell sent to trick 2 little cosplayers

You onste!

onste by FNF-kid June 27, 2021

Osteopathy

the only practice in the health industry that actually wants to and does make you better

Michael studied osteopathy cause he gives a shit

Osteopathy by suetrolldogg69 January 14, 2017

Onsen 

An onsen is a Japanese style public bath using volcanically heated hot water from the ground.

The term onsen is often used in the Japanese language in reference to the bathing facilities surrounding hot springs.

Onsen, when translated into English means 'hot spring', which can lead to confusion and miscommunication.

After watching the monkeys in the hot spring, do you want to go to an onsen?

Onsen by 7 years in August 20, 2013

Osteentatious 

Showy; pretentious. Interested in the cosmetic. Preaches but doesn't practice what he preaches.

Joel had a chance to open up his church to suffering Houstonians. He reminded us all how osteentatious he is when he chose to lock his TV mega-church up instead.

Osteentatious by Mr. Dyche August 28, 2017

Onterrible

Is used by Canadians to describe the people of Ontario. People who are from Ontario, but relocated to other, more friendly and sincere provinces also use this term. Concisely connotes a province of people beset by fake-friendliness, and a mentality hellbent on conformity above all else and a general intolerance for anyone that is not like them. One who will smile to your face and bad mouth you behind your back. Also used to connote a bigot or someone who hates and bad-mouths Americans, but spends half their lives in the US vacationing and shopping.

"Hey, where are you from?"
"I am from Onterrible. But I left there and so am now allowed to have a personality."

Onterrible by auswayward January 27, 2014

Sudden Onset Autism 

Sudden Onset Autism, or S.O.A for short, is an extremely rare condition of unknown origin. Development of this disease is both abrupt and severe. As of now, the pathogenesis and mode of infection have eluded even the most qualified of research teams at Harvard, Hopkins, and Yale. Some have suspected that transmission occurs through contact with an infected person, especially prandially. There is still hope for a cure, although we may be decades away.

Infected Person: Hey man, let's go grab some lunch
Healthy Individual: what?! It's 3 in the morning. What's wrong with you
Infected Person: Well... it's lunchtime somewhere!
Healthy Individual: Oh God, you have Sudden Onset Autism... Please go away from me!

Sudden Onset Autism by burner90 May 14, 2018