What's a Cokiso Coki?

Cokiso coki is the kind of shape of a shell. Sebastian marks has a joke abouter in his stand up about a phrase that starts with san and then it's a whole. Isi, shelf, ile. Cokie im leave a certain impression on something. Could this be apalic thing? Could this be stamp a shell? Ikay, that's what i thought it meant. Caus e coke killed.