In the upper peninsula of Michigan this has been used to designate a male person, or descendant of such, who has immigrated from Cornwall, England. The feminine form is 'cousin jenny.' These terms are often capitalized.
The famous pasty was brought to the upper peninsula of Michigan by the cousin jacks.
A term usually associated with a relative. Derived from the the Greek word "Dude." This is a term that often angers people with curly hair and cranes. In fact, one could be so inclined to go tell his dad, the principle and the football coach on whoever said it.
I have a jacked cousin!
Mr Osuch! He said "Dude my cousin's jacked!"