chip dust 

The oily/dusty stuff left on your fingers after you eat chips. Most often left by cheese puffs, but also left in lesser quantities when eating various flavored potato chips like sour cream and onion or barbecue.

Cheeto dust is the most well-known form of chip dust.

chip dust by happycookie May 28, 2011

chip dust 

the worthless llittle pieces of chips left in the bottom of the bag, too small for dip or salsa. the only acceptable way to eat them is to pour the bag in your mouth

dude you ate all the good chips,all you left me was chip dust

chip dust by douglas epley June 16, 2007