1. An initialism of "orange juice." I never eat very much for breakfast, usually just a slice of toast and a glass of OJ.
2. offensive slang To stab someone. A reference to O.J. Simpson, who was tried but acquitted of murder by stabbing. That dude had gang symbols tattooed on his arms. You're lucky he didn't OJ you!
tv. to stab someone. (Refers to the O. J. Simpson stabbing case.) Don’t worry. I would never OJ my buddy.