I don't mind wheeliebin. We have a tendency to naff-ify everyday items so they always sound unglamourous - witness Brit garage "garidge" vs US "gararj"). In Australia they were called "Otto", after the company that made them. 

Not sure which words I'm uncomfortable with. 

I try not to use Twat even though it can still happen when I'm really exasperated. 

Also loo and bog for toilet I avoid. Only bog is really off limits though.