the whitest cracker in the saltine box

A Gullible Caucasian

Alex: "So you want me to have you and 5 of your "boys" come by at 10PM to look at the Car I put on Craigslist"?
Tyrone: "Us Yeah I am rolling 5 deep, and want to pick it up on my way back from Appelton"
Alex" You must think I am the whitest cracker in the Saltine Box"