A mustache grown to aggravate someone usually a superior. The game ends when the you (the grower) get tired and shave thereby losing or the superior orders you to shave acknowledging that they got so annoyed they had to pull rank.
Guy A: I grew a cheesy porn 'stache just to mess with the boss. He's already threatening to order me to take it off even though he says he doesn't mind it.
Guy B: If it really wasn't bugging him why does he keep bringing it up?
Guy A: Exactly, the spite 'stache is working perfectly.