A "dead cat bounce" is a temporary recovery from a prolonged decline or bearish market, after which the market continues to fall. This term is often used in as slang in Stock Trading, Day Trading, Options Trading, and Futures Trading.
Dead Cat Bounce was derived from the statement, "Even a dead cat will bounce if dropped from high enough!" For some reason, it stuck.
Related terms: Momentum, Island Reversal, Bullish Gap, Bearish Gap, Gap Fill.