"Duckets" is the way people who are illiterate spell ducats. These people are so stupid they think that the phrase comes from rappers or Shakespear when in fact it was an ACTUAL type of currency. The ducat is a gold coin that was used as a trade currency throughout Europe before World War I. Its weight is 3.4909 grams of .986 gold, which is 0.1107 troy ounce, AGW, actual gold weight.
Most idiots on Urban Dictionary think that duckets is slang for money when in fact it ducats ARE money.