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Equivalent to the phrase "I'm up for it," but abbreviated. It's similar to saying "I'm down." Meaning you're interested in joining in on the activity suggested in conversation.
Ron: I'm really in the mood to get ice cream.
Fred: I'm up.
I'm Up by JewForensicsGirl March 5, 2011
Synonymous with "I'm awake." A two word phrase meaning that the speaker is, in fact, not asleep.
Someone getting woken up by their mom: "Ok ok mom I'm up."
I'm Up by GGGavin June 3, 2020
Awake; stimulated; conscious and responsive to external stimuli.

1. Some reference texts claim that “I'm up” is defined as physically out of bed. This is too specific to be precise. “Im up” (a colloquial shortening of “I'm up for it”) can also mean “Im down with it”. As spacial references, these definitions cannot coexist. Readers who deal with this inconsistency by choosing one definition and politicking for the exclusion of the other are invited to review the urban dictionary entry for “fuck off”.

2. For phrases meaning on one's feet, see: "up and about" or "up and at 'em".
You up?
(in bed, texting): I'm up.
I'm up by FlashPointBang September 13, 2020

I'm up to you 

A phrase used to signify to an individual that you are aware of their current level shenanigans and believe that you have surpassed them in your level of shenanigans.

The phrase is best delivered in a condescending vocal tone.
Garfield: Hey! Odie!
Odie: Whats up Garfield?
Garfield: I'm up to you.
I'm up to you by technocrat September 5, 2011

I'm up against a hard break 

When your wife, kids, or boss are arguing with you and you want to end it. Signaling the conversation is DEFINITELY OVER.
Used frequently by news anchors.
Wife: Baby, you know that trip I was talking about and the car I wanted, and the dinner party you said you would go to?

Husband: Sorry hon, I'm up against a hard break.

i’m up who 

How to make someone call themselves a poo
Knock knock
Who’s there
I’m up.
I’m up who?
Yes, you are.
i’m up who by 147852369/*-+.0 September 25, 2025
More from Urban Dictionary

briefcake 

"Did you check out the briefcake in courtroom C?"
briefcake by Ben Frey April 6, 2006
Word of the Day on November 3, 2026
Brought to public attention by Bob Woodward and Carl Bernstein in the book on the fall of Richard Nixon, All The President’s Men, ratfucker was Nixon’s term for a political operative who sows chaos among opponents; an agent provocateur. It is thought to have originated among campus political rivalries at USC, and seems to have some usage in the US military.
Along with Nixon’s other ratfuckers, Roger Stone caused fights at otherwise peaceful Democratic Party protests to generate a false narrative that the Democrats were violent and dangerous.
Ratfucker by Ricky Ramjet November 2, 2017
Word of the Day on November 2, 2026

countrypolitan 

Term used to describe someone who is a mix of both rural (country) and urban (metropolitan) lifestyles/upbringings. He/she is typically equally comfortable in both settings and is able to seamlessly slip back and forth between the two, appreciating the characteristics of each.
That ol' gal of mine drives the 12 lane freeway during the week and a John Deere on the weekends. She likes opra and the Grand Ol' Opry. I love them countrypolitan women.
countrypolitan by MOChick November 7, 2006
Word of the Day on November 1, 2026

Witch Bath 

A bath consisting of a variety of slats, oils, soaps or any other added ingredients such as fruits, milks, herbs or any other spices for health or beautifying benifits.
She brought home alot of stuff and took it to the bathroom. She must be taking a witch bath.
Witch Bath by carnieboy30 October 26, 2020
Word of the Day on October 31, 2026

kinktober 

An excuse for people to write porn with different types of kinks throughout the month of October.

Smut Fanfiction
That chick doesn't write often but when she does, its for Kinktober.
kinktober by Kinkiest July 12, 2018
Word of the Day on October 30, 2026

proper lad 

a lad that is such a lad that he is a proper lad
person1:did you see bob
person2: ya he was a proper lad
Word of the Day on October 29, 2026
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