Origin: [AS. habban to have + habban to have not; ne not + habban to have. See Have, and cf. Freebase(0.00 / 0 votes)Rate this definition: Hobnob is the brand name of a biscuit made from rolled oats and jumbo oats, similar to a flapjack/digestive biscuit hybrid. They are primarily sold in the United Kingdom, the Isle of Man and Ireland but are available in the U.S., and several European and Asian countries.