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(adjective) hard or erect
as soon as she dropped her underpants, I was up.
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Sexually penetrating another person, usually man-to-woman.
Get up her, man, the world ain't gonna repopulate itself.
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Not down.
[Up] is not [Down].
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The direction facing away from the field of gravity that most affects the traveler.
The elevator took us up to the seven-and-a-half floor.
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The direction above you, unless you are upside down.
Man, I was just sitting there and I was like, "Man, when I look up I see the sky."
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The ending for just about every city in Western Australia.
Noongar for 'place of'.
Joondalup, Karrinyup, Dandalup, Dwellingup, Nannup, Yallingup, Manjimup, Boyanup etc.
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UP can stand for UnderPowered, in contrast to [OP], Overpowered. It is used mostly in RTS forums for indicating a weakness in a unit, civilization, ect.
The Chinese anti-cavalry units are way too UP, as they have nothing to counter the splash attack of French Gendarmes, please fix it mods.