A 50 pounder is a consultant or advisor that gives unsolicited and useless advice, with the ulterior motive of getting paid for his apparently "quality" services. He is a salesperson, good with words, that can trick a naive person.
The 50 pounder is actually skint and has very little money in their bank account (about £50). When confronted, the 50 pounder gets aggressive due to his/her fear of being exposed.
To be avoided via good bullshit detectors and due diligence.
Dude, stop talking to him. He's a scam and his greatest achievement was only to be a 50pounder.
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 $2million.