A 12th round Knock Out= obtaining a dime piece just in time usually after the DJ announces last call for alcohol and right before the bouncers kick you out of the club.

yo just as the dime piece was getting her jacket from the coat check and the bouncer was about to kick us all out for the night i asked her if she had a good time tonight and she said yes, i then asked her what are you doing afterwards and she said i dont know is there anything to do? I then say why yes there is I have a condo in beverly hills and a COSTCO size Grey Goose bottle with your name on it. She then smiles and says lead the way back to your condo then. BOOOO YAAAAAAAAH 12th Round Knock Out biotchez!(true story by the way when CENTURY CLUB used to be crackin)