blamsucker
An exclamation or ejaculatory expression, tinged with dismay, what you say when you are dumbfounded or gobsmacked. Can be said of yourself, or to someone else.
Joe: "I saw your girlfriend making out with Fred."
Jack: "Blamsucker!"
or
Jack: "Can you believe she dumped me? Blamsucker!"
Jack: "Blamsucker!"
or
Jack: "Can you believe she dumped me? Blamsucker!"