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2.
A cool way of sayin goodbye to your homeboys or homegirls. Popularised by the song 'Yeah' by Usher, "Peace up A town."
1: "Ay yo im out of here man c ya laterz."
2: "Aight man peace up."
by Kenno July 18, 2006
 
1.
Peace-up means "peace". The "up" part is used because "peace-up" is usually followed by a city that's "down".
Peace-up, A-town down! - Usher from "YEAH!"

Peace-up, C-town down! - My homies

Peace-up, B-town down! - Jay-Z
by M to tha izzle September 19, 2004
 
3.
Peace-up means "peace". The "up" part is used because "peace-up" is usually followed by a city that's "down"...
Usher Yeah"Peace Up Atown Down"
by LilJOnWhattt July 30, 2005