Cannot bitch for toffee

We woke up to frozen waterpipes yesterday and - for some very strange reason - spending the morning outside in the cold with a hairdryer made me suddenly appreciate my half-finished novel again.    It's been on the shelf for a little while and I even know why: I just can't bitch convincingly!  The plot really needs it - and my main character can't just waft past and sneer Byakuya-style.

Hubby's suggestion to just leave that part out and carry on with the rest of the story is sound as far as it goes, but the missing bit stays in the background nagging, like a low-level tooth ache.

So, where can one go to learn how to bitch with gusto?  What a problem to have...