Plagiarizing content and republishing it as your own, as Cooks Source magazine allegedly did to blogger Monica Gaudio, as recounted on her Live Journal.
Bonus points if you also tell the person you lifted the work from that they should be grateful to you for editing their original.
-Dude! You can't turn that paper into to your comparative web class. You cooksourced it from Daring Fireball.
--Yes, but I edited that jerks words and made it better, so it's all good.
Stealing copyrighted material without contacting or compensating the original author.
Wow, great poem, Dave! You actually wrote that?" "No, I cooksourced it from Billy Collins on the Internet to impress a girl.