When a white person does a black person (guy or girl) doggy style, usually in the ass, resulting in the white person's dick being surrounded by lots of chocolate, and thus resembling the popular pastry treat known as devil dogs. Also known as "devil doggin' it"
It may not be a great idea to say this around U.S. Marines, as they are also called devil dogs; the easy going ones probably won't care, but you may get punched in the face by the homophobic ones who don't want anything to do with sharing a nickname that is also used for a form of anal sex.
Person 1: Yo dude I was just at Lateesha's house last night and her booty was so tight! It was mad good!
Person 2: Cool man, props for devil doggin' it!