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In PvP, "Chi" represents whole units of rage (actually "Qi," but everyone cares about that). There are a maximum of three, needed to activate certain skills, as well as flashes (1, 2, 3 Chi). Flashes, usually costing 3 Chi, are used when an individual is completely unskilled (a noob, clumsy, etc., whatever term you prefer), but can also be used to greatly satisfy oneself through NOOB-BASHING. Rarely used in tactical maneuvers, sometimes for better damage in PvE.
These "Chi" units are obtained in several ways.
1) by attacking anything.
2) with a potion and some skills.
3) and finally, if a male character is carrying a female character, Chi is accumulated automatically.
The t-shirt says "Chi to you," maybe it's a hint?!