KMS · noun, adjective, proper noun1
Abbreviation.
KMS · interjection, verb2
Initialism of kill(ing) myself, based on KYS (“kill yourself”).
KMS · noun3
From German Kriegsmarine (“Nazi Germany Navy”) Schiff (“ship”), from Krieg (“war”)+Marine (“navy”).
Etymology from Wiktionary, CC BY-SA 4.0.