I'm told the one long nail on the pinky finger is for picking your earwax out or picking your nose. What's the truth?

both

it mean i no need to work so my nail look nice

It also mean 'I Ladyboy in my spare time'

^^i agree. i heard it shows that a man doesn't have to work hard with his hands(like labour work).

How would you know, Simon?

In my observation it is a kind of statussymbol, meaning the proud owner indicates that he doesn't do physical work (which sometimes is true as well). The use as an organic, always ready cleaner, picker and scratcher is a mere added benefit, like using golf courses with the elite card.

Easier to pick up tose darn satangs off the floor