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1.
1. Douce is simply a synonym of the word "dude"

2. As well can be used as "Douce Maister" which is used to refer to the person who invented the word "Douce" or someone "cool" or simply "awesome"
"Douce what's up?", "Douce man Douce", " Yo Douce" Etc.
by Douce Maister July 07, 2011
 
2.
the second half of a spliff or cigaret
yo dude check me your douce
by jul_crimson May 05, 2007