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When a giant douche kidnaps a joke in a real-time discussion, then posts it on Facebook for credit, all while simultaneously bragging about his ubber biceps and amazing salary
a potential Douche-napping example:

A old semi-douchey co-worker contacts you via IM. You decide to tell him a joke created by you and no other. He hijacks the joke and posts it on facebook as his own, while simultaneously talking to you about how cool he is!
by w3birdman March 01, 2011