1) Mythological humanoid creature. Orginated from the old English kingdom of Cornwall. Orginally said to be the size of a large man and fed off human flesh, but now taken to be some kind of small giant
2) A vindictive individual, an unreasonable person.
My boss is such an ogre, he made me ork late three times last week and refuses to pay overtime.
A mildly offensive term of abuse normally directed at the wife. Used in conjunction with words like daft, stupid, silly etc. Popularised by the Alf Garnet characture in the sitcom 'Til Death Do Us Part'