Traditionally meaning "total idiot", duffer is a mashup which translates to "dumb
fucker." Generally viewed as an appropriate term for elderly
people who make absolutely zero sense to a rational person attempting to
understand their reasoning for doing what they do.
"Why is there a brake
drum in the dish drainer?" "I
don't know. Ask Duffer. It's his house"
Upon seeing shredded bits of garden hose scattered across the yard, it'
s safe to assume duffer ran another one over with the lawn mower.