Sentence:  “Yes, you may leave this little matter entirely to me, Mr Wooster.” “I wish you'd call me Bertie.” “Certainly, certainly.” “And might I call you Roderick?” “I shall be delighted.” “Or Roddy? Roderick's rather a <WSD>mouthful</WSD>.” “Whichever you prefer.” 
Meaning of the word marked with <WSD> tags:  Something difficult to pronounce or say.