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
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
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
a term people use when something smells like shit
P U! your breath smells like shit! Go eat a Tic Tac!
by Helliry April 15, 2006
Parental Unit
I'd love to go clubbin, but my PUs are gonna be visiting this weekend
by we91 April 16, 2009
Pure Enternity is forever
Join PU and you will forever be saved from damnation!!
by K Pop January 14, 2007
Player's University, a place that's hella tight
"Man, girls, look at those muscles on WC!"
"I knooooww, does he go to P.U. or what?"
by WC September 15, 2004

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