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Pop up. Often used on Snapchat meaning message me
by Maibow September 03, 2017
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An excalamtion denoting the presence a vile or unpleasant odor.
"P.U.," either use deodorant or keep your arms down!
by Anonymous August 24, 2003
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1) A way of saying, "That smells awful."

2) Official scoring of a pop-up in baseball.
1) PU, Dennis! Haven't you ever heard of deodorant? Or at least breath mints?

2) A pop-up caught by the second baseman is scored as 'PU4'.
by Diggity Monkeez January 20, 2005
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The liquidy excrement caused by the consumption of "gu" energy gels before and during an endurance event. pu can be found in toilets but definitive pu is seen running down the legs of long distance runners along marathon or iron man routes.

Pu is not to be confused with "the runs", aka regular diarhea, that have no direct affiliation with the act of actual running.
I eat Powerbars when I run so I don't have to worry about pu getting in my expensive running shoes.
by Jonah Ptak January 26, 2008
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