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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.
by JewForensicsGirl February 18, 2011
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Aug 3 Word of the Day
A way of expressing that someone is sexually attractive. It is often used with irony or playfulness.

Comes from the verb “breed” which is to copulate with intent of bearing children.

For someone to be truly “breedable” they need to be fertile.
Anon: You are looking mighty breedable this fine evening, m’lady.
Stacy: Please don’t say that to me.
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Brad: Woh, you look submissive and breedable, Becky.
Becky: Wow, thanks. *sex*
by 100PercentEthylAlcohol July 14, 2021
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2
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."
by GGGavin June 03, 2020
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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.
by FlashPointBang September 13, 2020
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Kathy: you two wanna catch this movie?
Liam: I'm down
Vincent: Sorry, I'm up. You two have fun.
by Banglatiger August 12, 2018
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