A dirty Cookson is when a male ejaculates on his own stomach or groin area.
This usually involves leaving the semen to crust over the belly and not get washed off.
This term is used to describe when someone has full-on lost the plot on MDMA. Symptoms include (but aren’t limited to) stroking bearded men, complimenting people wearing crisp shirts and overheating in premium Glaswegian establishments.
Dill - “I’m on the biggest comedown ever man.”
Dillon - “Oh, I know! You were absolutely Joseph Cookson’d last night at Subbie!”
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.