The grazing of a customer's shoulder by the breasts of the woman cutting said customer's hair.

The contact made between the shoulder of one person (usually male) and the boob of a female leaning over the shoulder of the other person.

That comfortable spot on a guys chest under his shoulder and above his nipple. Where girls (or guys) usually put their head when cuddling with a guy.

when the bra your wearing makes your boobs look like they are pretty much on your shoulders.