Also gesumph or gesumpf, said to have come into the British property business from the second-hand car trade in the 1970s.
originally means to swindle, cheat or steal, now means to outbid (peculiar to the English and Welsh housing market).
Ultimately derived from a German word meaning to put into a swamp or, in the modern idiom, to dump
in the shit. first recorded in English in 1928