Haggis Factor Share definition Flag A hidden cost factor used by any scottish person who owns a business. Mr. MacKay buys product at a certain price and marks it up using a haggis factor to overinflate the cost. Haggis Factor by hfactor October 12, 2009 0 0 Get merch Get the Haggis Factor mug. Buy Now — $32.95 See more merch