When beans in the phrase 'cool beans' are no longer cool, peas may be substituted with the same meaning only with a little more personal satisfaction attached and with the possibility of a bewildered look from a friend or acquaintance unfamiliar with how beans are out and peas are in.
Pamela- "Yeah sure! Where do you want to meet?"
Shela- "Let's meet at the Library."
Pamela- "Cool Peas"
David- "Hey Dude do we have a paper due in English tomorrow?
Johnathan- "No man. It's due next week."
David- "Cool Peas!"