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1.
It's like an intervention, only instead of confronting someone about their problem with drugs or alcohol, you confront them with their problem of being shitty at giving gifts.
Person 1: Aunt Carol gave me socks for Christmas AGAIN this year!

Person 2: Are you serious!? She really needs a giftervention.
by Ginger Claus December 02, 2011
 
2.
An Art intervention that involves Gifting an anonymous stranger with a piece of art.

The action of gifterventing has been performed over many years, but it really only came into its own when the Art Event Papergirl Berlin started random gifterventions, taking art out of the galleries and into the streets.
I can't wait till tomorrow, the giftervention at the park is going to be amazing!
by S.Girl July 09, 2012