Maybe those of you that don't understand, just don't have such refined noses as those of us that do. :D
Seriously though, it may include components that some people can smell and some can't, or that smell entirely different depending on your genetic provision as far as taste receptors go. For an example of this phenomenon, see
http://en.wikipedia.org/wiki/Phenylthiocarbamide - and potassium chloride, used in low-sodium salt, is another example. (Tastes of nothing - or tastes bitter - or tastes absolutely vile, depending on your taste bud genetics.)
I'm with Pauline, it makes me feel sick. I know pig nuts is pretty strong, but it doesn't smell of *dead* things. Nettle goop is more reminiscent of a rotting sheep carcass... :-s (Something I'm familiar with, from growing up in Mid-Wales - ahhh, the fragrant countryside...)
Thanks for all the replies - sorry I've been slow to get back to this thread, I was away on holiday for a few weeks.
I'm going to take the suggestion for burying nettles in planting holes - much more acceptable!