The ultimate minimalist shortcut in modern text slang. It acts as a logical connector derived from "eXtra" (furthermore) and "eXcept" (unless).
It is used in chats to either stack an additional argument or name the one exception that ruins the plan.
1. (Meaning: extra/furthermore) "I have a massive hangover, x I lost my keys."
2. (Meaning: except/unless) "We will win this match easily, x the opponent is cheating."