1 definition by mooface

The best kind of sister there is. The kind of person who finishes all the sentences you didn't even know you started, and gets sympathy sickness with you. Thirza's are also great because they know the rules of the game, and have the same horrible thoughts as you
Im so glad I have my own Thirza, I'd be so sad without one...
by mooface September 30, 2006
Get the thirza mug.