Part orange marmalade and part semen, usually found on a computer keyboard after a particularly rough masturbation session or quick pb+j snack (or both).
Has the ability to produce babies that are half human and half orange tree and can grow oranges for you all the time.
Friend: I just touched something on your keyboard
Me: Oh, thats probably just orange marmajizz
Friend: WTF is orange marmajizz?
Friend: WTF dude
Me: You've never head of orange marmajizz? Dude, take a fucking biology class or something. Seriously.