vigorish

noun4

1. •
   (slang) A charge taken on bets, as by a bookie or gambling establishment.

   • The bookmaker's mean profit per dollar bet is called vigorish or “the vig.” In our example, 11 + 11 = $22 is bet, and the bookmaker wins $1 so the vig is 1/22 = 4.5%. — 2009
2. •
   (slang) The interest on a loan of money, especially for loans made by a usurer or loan shark.

   • They lend you a thousand and call it a bone. It cost a hundred a week vigorish to borrow the bone. — 2013
3. •
   (slang) An amount owed on account of or payment of a bookie's charge or of interest.
4. •
   (slang) A commission or similar extra charge.