A lovely topic! Cribbage has a vocabulary all is own, as I suppose many old games do. I know of "His Nobs" and "His Heels" (original source: local practice in Quincy, Mass) but if it's also been His Head and His Heels that would make perfect sense.

Another delightful idiocyncratic usage is declaring "Muggins!" to take points for yourself if your 0pponent (the "Pone") fails to claim them. However, my current source (http://members.tripod.com/~Germantown_Peggers/muggins.htm) says, "...First of all, you can't mug a missed cut jack"! Of course Mr Swiveller antedates, but what the Dickens did HE know?

(Afterthought: When, why, and how did Dickens get to be eponymized in that fashion? It doesn't even have an obvious target to be a euphemism for.)