A Scottish word beleived to have originated around the Central Belt sometime in the late 20th centurey describing and object (usualy a vehical) which is in a delapedated state of disrepair and generaly an embaresment to the owner.
Jock #1 "Here mate, your car's an utter SHANNER!"
Jock #2 "Aye whatever man, your dirtbike's the biggest SHANNER i've ever had the misfortune to gaze upon!"
"Mate, i've had enough of this Audi! Its a total SHANNER!"