An aracane adjective used as an expletive in the earliest issues of Mad magazine (e.g. 1950's) - comparable to "garshdarned" (see examples). However, maybe it's true that it was also used to mean 'asshat' later on, as claimed above.) Possibly a parody of some German or Yiddish word, I suspect. Correct spelling may actually be 'furshluggenner'.
1) What the hell IS that furshlugginer thing?!?
2) Get that furshlugginer thing out of here!
3) Why would anyone waste their time on a furshlugginer thing like that?!?
A Shackteau is a humble, weather-beaten, structurally questionable shelter located in a spectacular or highly coveted place—Wales, Jackson Hole, Sun Valley, Crested Butte, coastal Maine, the Alps—where the building itself may be worth almost nothing, but the dirt, view, access, and mythology make it absurdly valuable.
In use:
Shackteâu - We thought it was an abandoned shed until the realtor called it a rare alpine Shackteâu with unobstructed views and listed it for $2 million.