The word "schnook" is a Yiddish term that means a naïve or gullible person. It describes someone who is easily fooled or taken advantage of. Full definition
Sex is a metaphor for every transaction, and we watch as DiCaprio repeatedly acts out his consummation of the deal in rooms full of voyeuristic traders, while some poor schnook on the other end of the line happily gets the shaft. (joyceschoices.com)
Woody Harrelson and Randy Quaid do all right as a has - been bowler and an Amish schnook on their way to Reno for a million - dollar tournament, but they can't straddle the line between the real and unreal the way Jim Carrey and Jeff Daniels did in «Dumb and Dumber.» (sfgate.com)
The analogy breaks down quickly however, as the poor skinny schnook would quickly learn to avoid the boxer. (judithcurry.com)