pu means to "pull up' or to show up somewhere. this phraze will usually be used when people want to fight.
person 1- "yo pu or ur pussy"
person 2- "yuh im not pussy tell me where and ill pu"
By Scarlett
Pu
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.