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1.
The act of reversing the "sync" of a cd to ones itunes library after unconciously adding. Typically accompanied with a: "How the hell did that get in there?!?"
"I put my iTunes on party shuffle and in between Dragonforce and The cars, Paramore and Evanescence made an appearance , so I had to Desync them."

"Lamesauce dude."
by Darcy Chumang August 28, 2008
 
2.
A action that involves immediately deleting a unwanted song from said person's iTunes library, typically followed by a: How the hell did that get there?
I put my iTunes library on Party Shuffle and in the midst of a awesome music setup, Evanescence made an appearance so I De - Synced her.
by Darcy Chumang September 22, 2008