An Italian offensive exclamation, mainly used in South Italy. Literally means "(fuck) your death and super death relatives". Can be used as adjective or as a simple exclamation.
As adjective: " Quel chi t'è stramuort del tuo amico mi ha trattato male" - "Your chi t'è stramuort friend treated me badly"
As exclamation: "Qualcuno mi ha urtato l'auto, chi t'è stramuort!" - "Someone crashed my car, chi t'è stramuort!"