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shorthand for "one and only one."

It indicate that exactly one object with a certain property exists. In mathematical logic, this sort of quantification is known as uniqueness quantification or unique existential quantification.
You may have onely cookie per person.
onely by adamwong246 February 22, 2014
Related Words
A nice hoe that is low key a dumbass. She is not that bitch who will buy you food bc she broke asf
HEY ITS THAT BITCHASS ONELY
Onely by Phil;) August 14, 2018
Content and fulfilled in one’s own company; alone by choice without experiencing loneliness.
I wasn’t avoiding anyone. I was just enjoying an onely afternoon
Onely by J-LP August 12, 2026

Only I get that joke 

The definitive statement that proves anything you say is an inside joke. Best used when everybody gets the joke or when the statement is in no way a joke.
"True Detective!? More like false detective... Only I get that joke."

Only on days of the week that end in “y”.

Only on days of the week that end in “y”… a saying that just actually means “every frikin’ day”.
Example #1

Question: Do you drink often?

Answer: Only on days of the week that end in “y”.

Example #2

Question: Do you use drugs?
Answer: Only on days of the week that end in “y”.

the only spot in the spot 

“the only spot in the spot” — the only visibly identifiable member of crowd that is not a member of the majority of that crowd including but not limited to:

The only Black person at a private school
The only White person at a Black Family Reunion
The only flamboyantly gay or lesbian person in a room full of Christian Nationalist
The only biracial person in a room full of uni-racial people
The only differently abled person in a room full of the biological normative

A single woman at a swinger’s club cruising for a threesome — so rare that they are called unicorns and have their own appellation.

Depending on the strength of character of the person in this situation. this can be a very fun, very comfortable, or very uncomfortable experience. And, if you don’t understand this phrase; then you have never been “the only spot in the spot”.

Ironically in a society and culture that prides itself on rugged individuality; there are still more extreme ways of being “individual”. Cultural food for thought.
When Gil Scott Heron attended an exclusive private school in New York, he was the only spot in the spot.

When my wife attended my family reunion she trumped my high yellow cousins by being the only spot in the spot.
More from Urban Dictionary

square grouper

Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
square grouper by slipsheet November 6, 2004
Word of the Day on October 7, 2026
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
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