Someone who is boss-eyed. One eye goes one-way and the other eye goes a different way. One eye is fixed, one is variable - hence, mortgage eyes.
Look at that cunt with the mortgage eyes...
A person of ill repute known for their sticky fingered thievery identifiable by their eyes being unable to both look at the same thing at the same time. Like mortgages, ones fixed, ones variable.
Mortgage eyes Deano stole that old ladies purse, when I questioned him about it he couldn’t look me in the eye