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. An uncircumcised man stuffs loose change into his foreskin before a sexual encounter. Then his sexual partner pulls back his foreskin and all of the change falls. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Megan said she wanted to do something new so i got out my spare change and hit the Jackpot! To become highly and unexpectedly successful, especially to win a great deal of money. The Sun UK players have won the EuroMillions jackpot 14 times in two years. Nearby words of 'jackpot'.