Definitions by Calum at Heriot Watt

Coining 

The sexual practice of inserting forms of tender, usually coins, into the vagina or anus(known as chocolate coining), notes, cheques or postal orders can also be used.

"I was coining this bird last night, she was jangling all the way home"

Coining by Calum at Heriot Watt January 21, 2008