Today I found out the origin of the term “ jackpot ”. Jackpot It just means that he has to be holding cards that will beat a pair of tens. Once the. Jackpot definition, the chief prize or the cumulative stakes in a game or contest, as in bingo, a quiz contest, or a slot machine. See more. a large cash prize in a game or lottery, especially one t Meaning, pronunciation, example sentences, and more from Oxford Dictionaries.