Tendency of a publicly traded market, such as a stock market, to rise shortly before the market closes (in a manner that is at once surprising yet somehow predictable). The adjective presumably comes from the American colloquial "josh", as in "joke" or "it happened again so you must be joking", and "jam" as in a supply of buying orders that overwhelms the selling pressure on the market.
by evanesce May 12, 2011
by MeekDaBeek July 15, 2022