I've noticed the same phenomenon Melissa. If it helps you're not the only turtle here. Count me in!
As for 'boyfriend', to me it means wearing my other half's crisp white shirt ( a look I find very sexy). Also, it kind of hints to an observer that the night before might have been rather raunchy, and that appeals to my Gallic sense of unspoken suggestion!!!. LOL! I also think I understand oversize 'boyfriend' cardigans or sweaters, and can see their appeal. But 'boyfriend' jeans?? To me, they conjure up an ugly baggy crotch, and overly-long legs. But I guess I must be missing out on something, cos everyone's talking about them!