Funny you should say that...

[Lalwendë]

From Book 4 Chapter 1 (currently the one being discussed in CbC):

We can't get down; and if we did get down, we'd find all that green land a nasty bog, I'll warrant. Phew! Can you smell it?" He sniffed at the wind.

Yes, toilet humour even in the books, which I see was grabbed upon in the film script (something like "Phew, smells like there's a nasty bog 'round here"). I remember that bit, the whole cinema started sniggering like school boys.