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A combination of the words 'legend' and 'bomb'. Meaning an ultimatum, generally used to describe a figuratively explosive legend.
Famous ledge-bombs include:

Zack De La Rocha
Freddie Mercury
Nelson Mandela

Definitely not ledge-bombs:
Kim Jong-Un
Osama Bin-Laden
Josef Stalin
David Cameron

In speech:
Dave: Mike just lent me a fiver and said I don't need to pay him back
Davros: Yeah, Mike's a ledge-bomb
by ElmoAndHimsleff March 03, 2014
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