A longer fingernail(usually the pinky nail) that's used to hold cocaine for sniffing. This nail would usually be longer than the rest of the nails. Also makes it easier to open a baggie.
"I noticed Eric sniffing alot of coke with his coke nails"
To be so drunk and/or high out of your mind that you can't see straight.
Girl I drank so much Ciroc, I was seeing blurred lines