(Mark Shoulson, HQ 3.1):   A weaker, less intense, possibly polite form of {ghuy'cha'} 

ghuy'cha'  		*guy'cha* (expletive) 

(CK):  Here's another word with strong force.  A Klingon might say it after receiving an unsettling communique.  It's a LOT stronger than the Terran "Darn it!" 

(Mark Shoulson, HQ 3.1):  Shows anger when things start going wrong; it's a stronger, more intense form of {ghay'cha'}

It should be noted that Mark Shoulson's comments are merely his own personal suggestions, and should not be taken as canon — a point he himself makes in the article.

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SuStel
http://trimboli.name