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1.
When someone loses all the stuff you lent them.
Chump: Awww man, John just lost all the DVDs I lent him.
FriendOfChump: Damn, you got sidekicked!
by RiffZifnab October 12, 2009
 
2.
the process of having one's digital data (e.g. contacts, images, music files) suddenly and irreversibly deleted from a local or remote ("cloud") storage device (e.g. mobile phone, computer, server) without having caused, or contribute to, such action
Girl, I would've called you back last week but I got sidekicked and lost your digits
by Jerome Crimes October 12, 2009