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2.
The acronym for "Peace, Love, Unity, and have Fun", usually a way to end a conversation (or any form of communication) on a positive note. It's derived from one of the pioneering songs of hip-hop by Afrika Bambaataa and James Brown. They are words to live by in hip-hop culture,

*On a side note, a lot of people tend to use "peace"; fewer use "love". No one actually combines the four elements altogether...
See ya later; PLUF.
by Ezzo June 11, 2013
 
1.
"a word you use when there is no other way to describe how you feel"
person a : pluf you, im on cloud nine :)
by -phhamate- July 06, 2009