A poor choice of symbolism, though: it’s actually righties who wear watches on the left hand. I’m not sure which is the cause or the effect, but the winding stem on most watches is on the right, so wearing it on the left hand presents the tiny hardware to the right hand; if you wore a watch on the right hand, the left hand would have to contort very strangely to manipulate the winding stem. Did the stem get its placement after the left wrist was chosen, or the other way 'round? I don’t know.
I’m not sure why, but right-handed women occasionally wear watches on the right instead of the more-traditional left.
As for the hankie code, I’d love to find three gay men who could agree on the distinction between “light blue”, “robin’s egg blue” and “Air Force Blue.” And since the Air Force only issues white handkerchiefs, where will I get an Air Force Blue hankie?
I’ll admit that the earring location, presence of a tongue stud, and even (for some kids) bracelets have well-defined meanings in their right contexts. I’d heard that various one-pant-leg styles meant “I’m buying” or “I’m selling”, and that the baggy clothes with no belt were an imitation of prison clothing, where you wear the size they issue you, and you don’t get a belt. All of these have one element in common: you choose to display them.
For that reason, I think the tattoo location “code” is a little spurious – if the “code” meant anything, wouldn’t the tattoo artists ensure that you’d heard of it’s meaning before permanently adding you to the club? What if your tastes change? What if the meaning of the code changes? It’s too much to leave to chance.
While we’re at it, does anyone know what the CD hanging from a rear-view mirror is all about? Is it just “oooo, shiny”?