Doing irreparable harm to your own best interest through the consequences of your own actions.
(1)Bill Clinton's relationship with Monica turned out to be karmacide.
(2) Hey man, did you hear that Max committed karmacide when he went on a drunken spending spree and over-spent his credit card by $10,000.
(3) I am asking Kelly to marry me, hope it does not turn out to be karmacide.
Prone to killing off the fruits of good karma by performing bad actions, hence, mean or evil to others. Compare with kargasm, karspasm, and karplastic.
He was deemed karmacidal because of his evilactions to take advantage of others for his own benefit.